CMMG .22LR Conversion Kit Overview

[@DMS1791]

Just came here to say: CMMG, you guys knocked it out of the park with this product. I have gotten 10x the CQB practice in thanks to this. I’ve used even the cheapest .22 LR ammo in it, from Herter’s, to Remington and Winchester. Absolutely boss engineers over at CMMG. It would be epic if you come out with a 30 round mag to better mimic standard ar mags.

[@linkbond08]

Please correct me if I'm wrong. I believe the reason they use a 25rd mag, is because that's all you can fit in a single file, in a magazine with the dimensions of a standard 30rd AR mag. 223 is wider than 22, but it's also rimless (and fairly cylindrical) which is perfect for double stack mags. 22lr is smaller, but it has a huge rim that has to be managed, the internal dimensions of the CMMG mags do a remarkable job at this, while being confined to the outside dimensions of a standard GI AR mag (they even put the lines on it) If they wanted to stick 5 more rounds in the mag they'd have to 1: make the mag about ¾" to 1" longer to accommodate the rounds and the extra spring length to push all of them up. This can make the mags not compatible with some mag pouches, making training, and storage slightly more difficult. Or 2: re-engineer all the internals to fit a stack and a half profile, the internal channel would have to be widened and geometrically modified, same with the spring, it would have to be modified to fill the channel and prevent snakeing, also the follower would have to be changed from a push top to a tilted style to guide the first round into a left-right pattern. In the end you'd have a much more expensive and probably less reliable 30rd 22lr mag, that can fit in standard AR pouches, and that more than likely ain't gonna sell well, because *_"why buy 1 30rd mag? When I can buy 2 25rd mags."_* Again please do correct me if I'm wrong. Besides quality 22lr comes in 50rd &100rd boxes, and 4 full mags make 100 square rounds, it's mathematically perfect.

[@cesarlopes1880]

I love the way he took it out at the end to show us nice touch

[@ClericalConsequences]

One of my favorite things about my conversion is being able to shoot .22 through a faster twist 5.56 AR barrel. It stabilizes the Aguila 60 grain SSS .22lr very nicely, and is awesome to shoot suppressed.

[@30rdmaga]

I wish I could find more of the SSS I have 2 boxes left and refuse to shoot em. Lol

[@BurrowsNE]

I also tried the 60gr aguila, it is the most accurate for me.

[@30rdmaga]

@@BurrowsNE man I wish I could find more of that I've got two boxes that I refuse to shoot because I have not seen it anywhere!

[@Marksman5147]

With a 1:7 13” barrel what kinda distance could you expect with these 60gr .22? I plan to use it for steel matches but there’s a few special .22 only matches that sound high speed enough to me that go out to hefty distances some of them even 230yds. I figure a 5.56 barrel probably won’t be able to reach those distance? What ab the 60gr ammo??

[@ClericalConsequences]

@@Marksman5147 I think any 22lr is going to be dropping like a rock at that distance. But a 60 grain at 1000 fps will certainly have an advantage over a 40 grain at 1000 fps. I’ve shot 300 yards with a 40 grain CCI standard velocity (1050 fps I think) and the holdover was about 15 feet to hit a full size silhouette.

[@bigfootlivz]

I bought one of these CMMG kits about 10 years ago for 25 bucks used in a shop. Came in a brown plastic box that was cracked with two steel 10 round mags. Worked fine in a rifle I put together. I later put a dedicated pistol together and reversed the gas block blocking the port omitting the tube to keep the gasses out of the upper. Stays a lot cleaner. I use several different plastic manufacturer mags in it no issues.

[@randomhobby3729]

Just got mine,. this is the best weapon I ever had, the most beautiful, the most fun, the most appreciated by my friends also

[@JoshHampton-xq6gd]

Just picked on up. CMMG brand. This is so much cheap fun! No recoil, very quiet, and very accurate. It's my favorite mod I have

[@1656nfa]

One of the best companies! I had a failure on the conversion while shooting suppressed full auto with my M16. CMMG sent a replacement part to repair the conversion, no questions asked, no receipt requirements or anything. And they are not afraid to express their faith. Absolutely great folks to deal with.

[@denniswilson1903]

This man knows where of he speaks. I have 3 of these and they are a ton of fun and savings. I would recommend using CCI AR Tactical with them for optimum performance, but they do work with other ammo brands. Obviously I am a fan.

[@philr182]

I got one of these about three years ago, with four magazines. I shoot 300 to 400 rounds every week, and it’s still going strong. The only thing I’ve had to do is replace the firing pin spring. I have one of those ultrasonic cleaners, I take the conversion bolt apart drop the pieces in the basket run it for about 20 minutes and it’s just like new. I bought one for my son the Christmas of 2022, and he uses it every week as well.

[@TexasEskimo]

I love mine. Perfect for handling drills and just plinking. Also, everyone wants to shoot it. Great product 👍

[@MCom]

I really like my conversion kit… runs buttery smooth and I’ve never had any failure to cycle or 22LR stovepiping that seems to be fairly typical on a lot of OEM 22LR guns or mags. Great investment and really fun to shoot.

[@LoneWolf23NJJB]

So what about the barrel can the round bounce of the side of the barrel

[@D34D22]

@@LoneWolf23NJJBNo,.223 and .22 have the same diameter projectile.

[@JohnStaley-e4m]

I bought this set and had a ton of problems in my Ruger AR556, specifically failures to fully eject with the brass getting caught up in the ejection port. I did two things to resolve the issue and now it runs great. 1. Put a little fuzzy side velcro on the top front of each magazine to take up some of the slop, and 2. Purchased an aftermarket charging handle for this kit that does not have the long groove on the underside.

[@LL-dj3oh]

Have had a cmmg 22 conversion kit for a few years, great product guys

[@ryank0351]

Cmmg has the best customer service in firearm industry from my experience

[@Rasterize1]

Done and done! Kit came and I converted my Banshee yesterday. Can't wait to hit the range!

[@rolflews]

Got one of these and love it, told two other guys about it and both were "really?" and went out and bought them.

[@2024MakeAmericaGreatAgain]

Everyone with an ar15 or ar pistol should buy one. I love mine!

[@russellleavitt4449]

Okay I would like to know if this conversion kit changes the zero of the rifles sites red dot and iron?

[@mnrodriguez]

Great question! Do you know the answer?

[@russellleavitt4449]

@@mnrodriguez well I used both and it doesn't change. The. 22lr and 5.56 stay the same.

[@mnrodriguez]

@@russellleavitt4449 , good to know, thanks!!!

[@russellleavitt4449]

@@mnrodriguez anything to help

[@Carlitos1909]

May I ask what ammo did you use? I sighted my ar15 with 556. When i changed to 22lr the zero was definitely not the same. I was using aguila round nose. ​@russellleavitt4449

[@rome4060]

Love this product, I have purchased 2 for me and 1 as a gift for my brother in law, he loves it. Saves me a bunch of money

[@CMMG]

Great to hear!

[@jaredfredericks1460]

Just ordered this bad boy, cant wait. 22lr from a 16" barrel AR with red dot and magnifier. This will be a cheap way to have a blast!

[@jdc8352]

Thanks for letting us know

[@robertd9850]

Just got my first AR-15 yesterday. Looking forward to installing this first to learn and then to save some bucks practicing. I'll shoot some 223 and 556 from time to time but this kept me from needing to buy both the Z-15 and the M&P 15-22.

[@anthonyfletcher8053]

This what I SHOULD have done.. spent hundreds on ammo (.223/5.56) and feel like it was a “waste” as training was so limited and duration between sessions were so far apart. This should definitely help me out!

[@chriscerta9821]

How do you recommend maintenance of the conversion kit and barrel?

[@alparrish5660]

I've been thinking of going this way. One of the video;s I saw was to add a Presser Buddy and an insert on the charging handle. One is to take up slack in battery, and the other prevent gases from blowing back in your face. I did not notice when the video was made, so maybe the new stuff is already incorporated!

[@isaacwier9406]

Probably the best thing I bought for my AR by far.

[@mlrllama]

Bought one a few months back and just installed it this weekend. Unfortunately, it was an absolute bust in terms of reliability. From what I could surmise, the problem appears to be the magazines. My kit has the mags with the red feed ramps and removable bottom plate to access. These have a lot of slop in them when seated in the mag well, causing the ramp trajectory to feed bullets at a steep angle into the chamber leading to FTF. Once the first round fed, the problem would somewhat clear up but never was more than 80% reliable. In contrast, my buddy also bought this kit, but his had different style mags that had orange feed ramps and six (6) screws to take them apart. His kit operated almost flawlessly right out of the box. In troubleshooting, one of the things we did was swap mags, and sure enough that appears to have cleared the issue. I contacted CMMG in hopes I could trade in my mags or at least have them send me the orange followers. Hopefully I hear back from them soon and get this fixed because I really want this kit to work!

[@themasterocktv82]

Have same issue with "red" magazines. It defenetly do not works as it should at my PSA ar15. Did support guys help you?

[@mlrllama]

I reached out to CMMG customer service, and they got back to me in 3 days. The guy who helped me was great to work with, and after taking my information and issues I was having, he is sending me new mags. However, he did say they would be the same Gen 2 style mags I already have (red followers with waffle texture). I don't know if it'll solve the issue, but we'll see. I'll report back once I function check them.

[@themasterocktv82]

@mlrllama Thanks for reply! Got you!

[@JohnStaley-e4m]

I bought this set and had a ton of problems in my Ruger AR556, specifically failures to fully eject with the brass getting caught up in the ejection port. I did two things to resolve the issue and now it runs great. 1. Put a little fuzzy side velcro on the top front of each magazine to take up some of the slop, and 2. Purchased an aftermarket charging handle for this kit that does not have the long groove on the underside.

[@mlrllama]

So, update on my kit: CMMG sent me three new mags to try out. On first inspection the springs seemed more stiff than the originals, so I was hopeful this would solve it. Unfortunately, it did not. Same feed issues as with original mags, even with sturdier springs. I even swapped out the factory springs with Bore Buddy replacements, to no avail. I also tried CCI Stinger ammo as well as Tac-X designed for AR-15/22 setups...no go. At this point, I'm convinced it's the loose fitting magazine in the mag well throwing off the feed ramps causing it to bind up. I guess I'll try other mags at this point. I hear S&W 22 mags are stellar so might pick one up to see. Shouldn't be this annoying...

[@coaklandva]

This is actually so cool!

[@lucky-rowe2623]

This is part of buying an AR15 in my view. A 100% must have for sure! You also should buy a Lightin' Grip speed loader.

[@markbrouk7857]

bought one of these last week, can't wait to use it.

[@forkscrew]

Even more fun when suppressed! I have the Adam Arms piston kit on my MSR and it cycles the bolt with no issues. Using standard velocity 22LR the action and hitting the target is louder than the report of the shot.

[@bryantrudy568]

Pretty wild! I think I’m gonna have to pick one of these up.

[@Murph945]

If you have a .22 conversion kit fitted to your AR can you use a .22 suppressor or do you have to use a .223 5.56 suppressor?

[@zm1786]

You can use a .22 supressor. Just don't shoot a .223 or 556 through it

[@rtcoleman3626]

I love the AR lower you have multiple uppers for one lower,what's not to love 😁

[@steverussell6642]

Just got mine still in the package ready to get it out and try it

[@steverussell6642]

How was it?

[@michaelochoa9282]

I fell in love a lot harder when I got that cmmg conversion

[@jpdaddy678]

Great addition to my rifle..gives me a lot of hands on for cheap

[@Hubbardfarms]

Are these full auto rated for binary trigger setups ??

[@jayinmass]

Great to have saved me big time 💲 training during cov id🇺🇲👊

[@Weptek911]

I have one and it runs great in a shot out m16 upper I picked up at scrap prices. Very reliable.

[@JoeSmith-zi3bi]

I must say that I'm thoroughly impressed. I figured out that this would be the perfect setup for a buffer tubeless AR pistol. Sure is nice to knock off 6 in off the back of this AR pistol by not having the tube there at all. I just cut the threads off of the tube and still use the castle nut for several obvious reasons. It doesn't work perfect because it's only a 7 inch barrel and maybe it's a gas pressure problem. I'm sure I can fine tune this. First I'm going to try a weaker hammer spring. If no luck then I will try opening up the gas block a little bit. But it works well enough that I know that I can get this to semi auto perfectly. Nice job cnmg.

[@CMMG]

You shouldn't have to adjust gas since the conversion is blowback. If you continue with complications, please reach out to our customer service team. They can better help you trouble shoot it.

[@JoeSmith-zi3bi]

@@CMMG that may be true. I think it's an incredibly great conversion kit. But remember I'm using it on a pistol with a 7 inch barrel so maybe I'm not getting enough gas pressure because it's a 22 caliber LR anyway

[@JoeSmith-zi3bi]

Oh wait a minute... So in other words, it does not use the gas tube at all even though that it is still left intact and it is all solely relying on the recoil of the cartridge?

[@CMMG]

@@JoeSmith-zi3bi that is correct

[@JoeSmith-zi3bi]

@@CMMG thank you and that is very helpful to know. And I just want everybody to know that I think you are offering an excellent product and I have heard nothing but good about it. I would like everybody who is reading the comments to know that I am actually doing something a little bit different. I am using your product to create a pistol that has no buffer tube. attached. I am expecting to have to do a little bit of tweaking. However knowing that I think I'm just going to shoot quite a few rounds through it and see if maybe a break-in will help. And even if I have to tweak something... I feel confident that I will not have to modify the cmmg kit in any way. You folks do have an impressive design Thx.

[@stefanmolnapor910]

Best kits ever!!! I give these out as stocking stuffers for Christmas, they are so great!

[@stefanmolnapor910]

@@MrSoonermadman they are priced very well for what you get out of them! Its an amazing deal! If you live in SWFL, Yes i will.

[@MrSoonermadman]

They are awesome. I have a very old edition and the magazine WAS horrible to deal with, but two days ago cmmg told me how to fix that issue and now it drops like butter. I will definitely be picking up some of those newer mags for extra. My bolt still works flawlessly. Also, great idea as gifts! A true 2a supporter.

[@stefanmolnapor910]

@@MrSoonermadman good to hear! Amen brother!! 2A all the way!!! I am anxious to try the new mags aswell, even tho i never had any problems with mine 🇺🇲🇺🇲🇺🇲

[@Brandon-ob8ul]

I was so about to buy that upper receiver off ur website till I noticed the plastic deflector. Man wish yall kept that metal I would have ordered on the spot.

[@VapeTime79]

I'm watching this video because I'm planning on buying this next week and I'm just a little bit skeptical. I don't see how it's not going to damage the barrel but I'm here to learn

[@CutlassOutdoors]

I’ve had a couple of these over the years and I love them.

[@Papasquatch73]

I’ve had mine for nearly 20 years. There’s a lot of good reasons to use it. It’s your weapon, your optics, your charging handle, your trigger. Sort of think of it as dry firing on steroids

[@steelcitytbirds]

Are those new magazines with the red follower any different than previous generations?

[@CMMG]

Primarily in design. Function is the same, but with an added piece on the follower to better actuate one of the old bolt hold open kits.

[@charlesmccarthy2064]

Bought it 3 years ago finally tried it today. I highly recommend this purchase mie would only eat CCI STANGERS fortunately I have lot nothing else would work Federal armscor none of it so 20 cents a round not 7 with strangers 0 malfunctions no other ammo would feed

[@joshkelsch445]

Try CCI AR Tactical rounds. They're about .08 a round everywhere.

[@fubuh8r]

If used with the Catch 22, will the newer magazine engage the catch?

[@danbrro]

I love mine !!! I also have a folding stock adapter, Will this BCG work with it? I heard it doesn't use the buffer tube or spring it's all done internally in the upper? Is that correct

[@CMMG]

it should work and even shoot with the folding stock adapter folded.

[@georgegeeseman6652]

Just bought my 2nd one.many pluses.few minuses.really good for wearing in New parts in New builds. Thanks.

[@JoeSmith-zi3bi]

Here is an update to my cmmg 22LR conversion kit. I wanted to build an AR pistol without the buffer tube. Realizing that this kit does not use the buffer tube. I thought it would be perfect for my build . Turns out that I had problems with misfire. The reason is because the buffer spring keeps the cmmg conversion bolt carrier held firmly forward into the chamber. Soooo, I made a threaded plug in my Lathe that threads into the lower receiver and tightens with the buffer tube castle nut. In this plug, I also threaded a 3/8 -16 thread in the center using a shortened hex head cap screw so that after pinning the upper to the lower, I can tighten the cmmg conversion bolt carrier into the chamber. (Only finger tight of course). Wow! I must Give Cmmg a big 5 Star for their design. I just built an awesome semi-auto 22LR pistol that I love in every way. It's much more compact than any other AR pistol. I'm using a 9" barrel. Blocked off gas tube. And it is quite accurate too. Other than what I described about the plug and gas tube , there are no special modifications to the upper, lower, barrel or Cmmg conversion kit whatsoever! This ain't a hard build if you can make the rear plug as I described. I would like to post a pic but I don't think it's possible in this comment section. She's a black beauty without a tail. Thank you Cmmg! Couldn't have built a buffer tubeless AR pistol without you. ❤❤❤

[@elsenorloco84]

If i simply start immediate actions slap that mag like a latina with attitude rack the slide like your pulling her hair will it cause issues? Basically every reload practice immediate procedures for a malfunction?

[@MadNeilPaco]

Did y’all notice differences between using one in a .223 only barrel? Does it make a better seal?

[@readelundy7620]

Have one for a few years and never used it yet.

[@forestnfren8146]

my bolt doesnt like to seat all the way with hollowpoints. is this normal for your conversion kit?

[@tf2529]

Do you need to shoot a certain grain such as 40 gr?

[@mrlqt-p3i]

I bought my kit a few years ago, it was buggy, the magazines fit lose in the well. Kept jamming, I had to add epoxy to them for a snug fit. Haven't used the modified magazines yet....

[@flawless1up]

boonie packer better mag adapter, allows you to use s&w 22lr mags. i never have issues. also recommend using a 22lr charging handle and tacom pressure plug.

[@axelkarsten9828]

and if i buy the 22 version, can i buy 5.56 bolt? i ask because in my country we cant get the 5.56, but i can import the 22 version

[@nilsgustavjohan]

Hi, I just had my conversation kit delivered. But it keeps misfiring every 4-8th shot (casings getting stuck). What could be wrong?

[@CMMG]

sorry to hear about the problem with your conversion kit. please contact our customer service department as they'll be the best way to troubleshoot the issue directly with you and they can get more details. Sometimes it's as simple as making sure the conversion is lubed well, other times it can be ammo selection.

[@Thee_Analyst]

I have 3 of these and currently buy additional mags for them. Btw, is this legal against the California AWB? Other than the 10 round mag version?

[@MrBigleo25]

so what about the barrel are u still using the 556 one

[@CMMG]

yes. the 22 conversion just changes the bolt and carrier and magazine to allow use of .22lr in a .223/5.56 AR.

[@anonymous_touch]

I don't have to convert my barrel? Will the round wobble down the barrel if I don't have the correct bore (the bore being bigger due to it being spec for .556/.223)?

[@anonymous_touch]

I have a stock Sig Sauer M400

[@CMMG]

It's minimal difference in bore. The biggest differential will be the twist rate. The conversions aren't going to be for accuracy, more for cost effective training.

[@anonymous_touch]

@@CMMGLink to conversion kit?

[@ErikTk421]

The only thing this video really told me about this product is that it exist. Is it accurate? Is it reliable? Is it or isn’t it depending on the ammo? Idk but it exists 👍

[@spacemarin04]

You make a speed loader to go with those mags?

[@CMMG]

We don't make it, but we highly suggest the McFadden Lightnin' Loader. We have them on our website. Makes events we go to so much more manageable.

[@Chaz31358]

My experience is that these are jamomatics in any rifle with a mid length or longer gas system. Carbine length gas systems and under, they run like a dream. Now I just wish they'd build one in .22 WMR.

[@charliehotelromeo284]

Where can i find the mags alone?

[@CMMG]

part number 22AFC2B on our website or your parts dealer

[@rcrtvtv7084]

Great explanation thank you

[@ColdPotato]

Do the Paul Harrel, shoot until you have one round left. Drop mag, put in another and keep shootin'

[@LastNameTom]

Will this work with a piston ar? An Adams Arms piston to be specific?

[@CMMG]

It should. We modified them many years ago to work with most pistons. Looking at the Adams Arms, they're similar to our old ones and should be good.

[@E.IS.M.I.A.]

Might be a dumb question, could you use this conversion with a 300 blackout barrel setup, I know it’ll probably be less accurate for sure but besides the case shape I don’t know if it would work or not

[@CMMG]

you cannot. the chamber adapter is for .223/5.56 chambers only

[@evann1136]

Are the 10/25 mags convertible if legal?

[@topwop5900]

It's worth every penny!

[@kevinhovis4]

If your having trouble try adding an extra buffer, quarters or something to take up space in the tube and tighten the spring. It helps stop the spring from causing bounce back. Then get an extra charging handle and fill the back inch with hot glue that will help with powder burns. And don't run for crap I'm ati polymer

[@Th3og0ny]

Do you also need to swap out the barrel since you're now firing a .22lr?

[@CMMG]

No. .22 vs .223 are pretty close. Only thing is, the twist rate on .223 isn't optimal for the best accuracy, but it's good enough for training and plinking.

[@Th3og0ny]

@@CMMG appreciate the clarification

[@TheBubblejunkie]

Mines a single shot mostly, fails to charge, eject, I've never shot a magazine wo errors, I literally let new people shoot it so they learn safe clearing practices cause that's what they mostly doing when shooting it 😢 tips or tricks to actually get it to work well?

[@JohnStaley-e4m]

I bought this set and had a ton of problems in my Ruger AR556, specifically failures to fully eject with the brass getting caught up in the ejection port. I did two things to resolve the issue and now it runs great. 1. Put a little fuzzy side velcro on the top front of each magazine to take up some of the slop, and 2. Purchased an aftermarket charging handle for this kit that does not have the long groove on the underside.

[@maciejmaterna946]

Is this kit compatible with PWS rifles with long stroke gas piston system? Specially PWS MK111 Pro?

[@CMMG]

The .22 conversion is straight blowback, so there's no need to worry about the operation. As long as the piston is removed from the system it should work just fine.

[@boomer_75]

How about .223 wylde chamber? Stag arms ar15...it works?

[@CMMG]

We design them for 5.56 Nato/.223 Remington chambers since those are what we chamber and are the 'mil-spec' that are more commonly available. We do not guarantee the compatibility with .223 Wylde chambers.

[@dirtroadrenegade588]

i have one of the new kits, i dont know about it! first price was insane but i found it on PSA for like $160 with 3 mags(by the way are a pain to load), then spent shells keep getting stuck even with the special charging handle, a few failer to eject and after about 500 rounds holy crap is my gun dirty, looks like a 50 year old gun thats never been clean lol,

[@CTorres_1993]

It's fun when it works. The most frustrating thing is, the kit is not consistent when it wants to work. Somedays I can go 500 rounds without a malfunction , but others I can't shoot 5 rounds without a jam.

[@plaiskool64]

So the bullet is fired through a 223 barrel correct?

[@CMMG]

correct. this conversion adapts the chamber to accept the .22LR cartridge, and allows the magazine to feed properly

[@jaystonkey]

Is there any problem using this adapter when shooting through a Cold Hammer Forged barrel? Thanks!

[@CMMG]

not at all

[@jaystonkey]

@@CMMG wow!! Thanks for the quick reply 😁 now time to burn some cartridges!

[@jaystonkey]

@@CMMG I'll be using lead round nose, will that cause any catastrophic failures?

[@CMMG]

@@jaystonkey They are a lot more prone to jamming and fouling. Just be mindful of the possible jams, and make sure that you clean the gun real good after use.

[@jaystonkey]

@@CMMG much appreciated!

[@tresavage1887]

Can you guys make a conversation kit for 308 to shoot 556 like the colt 901 did

[@Aviation_Professional]

So this kit wont work with my mkgs banshee 9mm? Only the 5.56 ?

[@CMMG]

Correct. These are only for 5.56 chambered ARs (and there is also one for our Mk57 uppers), but nothing with a larger bore.

[@Aviation_Professional]

@@CMMG ok thanks. Will need a .22lr option at some point! Ty

[@coreyhollingsworth1005]

Does it work with a folding stock?

[@pugger01]

Yes. The bolt’s travel is only the length of the conversion unit itself.

[@lhandlott]

do you offer it in 22wmr?

[@nyuu444]

What year did you guys release the 10 round conversion kit? Its awesome!

[@CMMG]

It's been out for quite some time. We'd have to look for the exact release, but with magazine restrictions, we had to adapt early. We'd estimate every bit of 8 years.

[@jaredhighlands4604]

Does anyone know what ammos go good throuh this. Just bought mine and remington golden bullets are jamming alot. Trying cci and winchester next

[@dustinvangeison]

I keep seeing different answers to this question: What grain and type of ammo have you used and what tends to work best? Id love to keep the price under .08 cents a round with todays prices but i just keep seeing conflicting answers. i have a 16" Stainless Steel Barrel PSA built rifle.

[@CMMG]

The main thing is to go for copper jacketed ammo. It just feeds better. We see a lot of 36-40gr running great.

[@NXXCHIE]

I really wonder if you guy’s could pull off a .300blk conversion to 9mm kit. Then I’ll never be able to deny .300blk because I could utilize you guys 9mm conversion kit with same reasons for the .22lr kit. 9mm AR bcgs already exists for the AR platform could you guys modify one, I’m just saying lol. It would definitely get me into .300blk knowing I could use another caliber with one barrel. That would be sick!🤯💯 … or maybe it doesn’t have the correct circumstance for bullet projectile fitment?

[@nottheatf841]

Does the conversion kit work in a side charging upper?

[@CMMG]

Only if the side charger would engage the BCG like a traditional charging handle would.

[@nottheatf841]

@@CMMG if I knew that I wouldn’t have asked. And if by traditional you mean rear charging, the side charger dosent sit on the bolt like a rear charger, so then that’s a no?

[@CMMG]

@@nottheatf841 There are a variety of styles of side chargers to choose from. There is no definitive yes or no response since it can be either yes or no depending on which side charging option you choose. The answer truly lies in the selection you make.

[@zinfendal0]

This runs great in my hoffman tactical made parts.

[@harrismahaffey201]

Do you have to re-zero your optic?

[@pugger01]

Yes. Or just remember where it hits.

[@bradwjensen]

This doesn't gunk up the barrel? Say you have a really nice, expensive AR-15.. Would you suggest against using this in that expensive rifle?

[@CMMG]

we wouldn't recommend it for prolonged use without cleaning. even just switching back to 5.56 on occasion will help that from building up

[@mnrodriguez]

Will it work in a AR Ruger 5.56? Thanks!

[@JohnStaley-e4m]

I bought this set and had a ton of problems in my Ruger AR556, specifically failures to fully eject with the brass getting caught up in the ejection port. I did two things to resolve the issue and now it runs great. 1. Put a little fuzzy side velcro on the top front of each magazine to take up some of the slop, and 2. Purchased an aftermarket charging handle for this kit that does not have the long groove on the underside.

[@0214Bub]

I own and have used your conversion kit in the past with good results in general. I stopped after picking up a 15-22. Been looking at your dedicated 22lr uppers which I assume work just like conversion kit without the chamber adapter. Couple questions, since I have a bunch of 15-22 magazines I was wondering if you have tried the Better-Mag adapter in your conversion kits and 22lr upper? Also, with the dedicated 22lr upper what kind of accuracy can you expect with something like CCI MINI MAGs? I ask because with the conversion kit I have noticed I get some back and forth movement inside my upper which seems to open my shots groups up somewhat.

[@CMMG]

We've not tested with the Better-Mag adapter, but know a lot of people run them with little to no problem. Regarding the dedicated upper, the main thing is you will have the correct twist rate therefor a more stabilized projectile and it will be more accurate. While the conversion kit is decently accurate, dedicated is the way to go if you are wanting the best accuracy.

[@flawless1up]

i use that mag adapter, it's awesome. last round bolt hold open, easier to load mags, never have issues. it's on my 4.5" cmmg 22lr upper and after 5k rounds i still can shoot out a bullseye

[@tlc239]

​​​​​​@@CMMGhey there. I just purchased one of the conversion kits. For some reason and Ive tried it in two different rifles. You either have to hold pressure up on the mag or bench rest it or it will not feed when pulling the charging handle or feed while firing.

[@CMMG]

@@tlc239 what kind of lower? That sounds excessively loose

[@tlc239]

@@CMMG I tried it in a Ruger 556 and a PSA lower. The mags are tight no play thats what makes no sense. My buddy has a conversion kit feels the same as mine but his works great. It runs great when I bench rest but I cannot chamber a round unless a lil upward force on mags.

[@luckyking63]

I have used the right hand kits with no or few problems. I am a gunsmith and have owned my own shop for a very long time. I am a left hand shooter and just received my new left hand kit. IT WILL NOT RUN IN ANY OF MY GUNS !!! I have tried it in FIVE different guns ranging from 10.5 inch to 16 inch barrels none with 556 wyle barrels. I have also tried using the Buddy Kits with no help. Wondering if I just got a lemon ? Not trying to be an ass but Something just ain't right? Help please?

[@CMMG]

Please email our customer service team. They'll be able to go into this more in depth with you.

[@trevorxhernandez]

Will this damage a 5.56 suppressor?

[@CMMG]

We would advise against using it with a suppressor as the rifling for a .223/5.56 is a different twist rate and doesn't stabilize a .22lr properly.

[@trevorxhernandez]

@@CMMG Placed my order today thanks for the reply!

[@jpdaddy678]

I wouldn't throw away the rubber protector..good to put on if you're keeping in your traveling bag or whatnot

[@kellyash45]

I've had mine for a few years now and these things shoot as about as good as any other semi-auto .22, other than maybe an accurized rifle. My favorite thing about it, other than it's accuracy, is that it allows me to shoot 2 calibers with one gun so I have more space for steaks and beers in the truck.

[@ericktorres5451]

I’m so confused on the battle situation lol , so u don’t need a 22 barrel ?

[@Of-AgeConsentingNon-Related]

nope. the cmmg bolt inserts into the chamber snug and has a smaller chamber to hold the 22lr, allowing it to fire easily and safely from the 223 barrel

[@paulsharp3748]

I just wish they still included them in the brown hard cases.