Dual Ejector AR Bolts - The Good and the Bad

[@eldiablo7862]

Sounds like a solution looking for a problem.

[@echofoxtrotwhiskey1595]

Not on .308s

[@chipsterb4946]

@@echofoxtrotwhiskey1595correct - a .308 case weighs a lot more than a 5.56 case and dual ejectors help with consistent ejection. For an AR-15, I agree with the OP.

[@99cobra2881]

This seems be a common for 6.5cm AR-10s to use a dual extractor bcg Great info about dropping buffer weight or spring I never knew this Thank you SOTAR! 🍻

[@Scott-pr9qg]

Habe one in mine and it worked out great and removed the blown out primers issue i was having. Was the only hp bcg i could find in stock at the time.

[@brentsproc]

Wrong trope. You should've invoked the "one is none" quote.

[@AustinChristopher88]

I have two nuts 🥜, why not two ejectors ?

[@ekfinn]

Your logic is sound.

[@brianisaacs5457]

If a human was a possum

[@Hiddencomment007]

Beat meat two it? Sorry😢

[@JasonHenderson]

Braggart

[@johndecker9983]

If my battle buddy had 2 eyes, I'd still have both my balls, and I wouldn't be on my third marriage...and wait, what was the question 🤔

[@frobbit30]

Thank you for this video, I had no idea that dual ejector bolts had these addendums to proper utilization!

[@snbifb8293]

I like it because it makes a smiley face

[@lancealbrandt9719]

Hear me out . . . 3 ejectors

[@tojun7687]

While you’re at it, can I get a 6th blade added to my razor. Somehow 5 blades just aren’t enough.

[@CascadingDream]

The ejector springs in dual ejector bolts are supposed to have a lower spring rate to avoid the loading and extraction issues you described.

[@Hiddencomment007]

Really? He didn't mention that. Maybe he didn't know. Thanks for the info

[@12121212smoke]

thanks for the awesome content. Im looking forward to a full "Physical" of a KAK down vent BCG!

[@RAWBOT301]

Mine has been running great. Makes a little more carbon residue, need to clean every 250 rounds instead of every 500.

[@12121212smoke]

@@RAWBOT301 no issues with mine either, nor have I noticed that I need to clean any more often than usual. Im more curious about how well manufactured it is. Would love to see it gauged and walked through in detail.

[@onpsxmember]

@@RAWBOT301 What ammo do you use and what barrel length?

[@RAWBOT301]

@@onpsxmember 8.5" barrel, AAC 220 subs, AAC 110 vmax, 2.1 oz buffer, kak dual extractor bolt and kak downvent BCG, lahar 30L. When it gets really dirty it wont fully seat usually after 200 to 300 rounds. I think I could add .2 oz to the buffer to help with that.

[@PathfinderDefense]

I build and run a ton of full autos and in my opinion the K-Spec Down Vent Dual Ejector with sand cuts Full Chrome are some of the best BCGs on the market I would put them up against KAC any day. If @SchooloftheAmericanRifle wants to do a physical on one I will gladly send it to him.

[@dangerdoberman]

Good information. I'll stick with my one ejector.

[@bingethinker791]

If it’s peening one , it’s probably peening the other. Are each “half power”? Are both “full power”. Do these eject brass so forcefully they cause casualties to bystanders? Would 3 ejectors be better? I have a Beretta that doesn’t have an extractor or ejector. 950BS. Defies logic. Just being obtuse 😀 Love the channel.

[@vettepilot427]

Gunsmith here. The biggest issues that I see in the shop related to ejectors are frozen ejectors from rust and crud. This can happen with dual ejectors, single ejectors, and even new guns if chemicals from the coating process are not cleaned thoroughly from the ejector hole. BTW, airbrush cleaning brushes from Harbor Freight are ideal for cleaning down inside ejector bores.

[@johndecker9983]

I've never experienced a problem with my single ejector bolts. It is something to consider for future projects

[@Gunner-73]

My 308 has a single elector and has always worked just fine. My 300WSM has dual ejectors and I've had issues from the beginning.

[@jcraigshelton]

This must be the internet AR firearms enthusiast’s version of controlled round feeding. That is, the solution to a non-existent problem which was thought up at someone’s desk.

[@SigmaSheepdog]

Dual ejectors are one of the many "tacticool" AR related gadgets that are more of a 98% want than a 2% need.

[@colkilgore9973]

Then don’t buy a SR-25 or LMT MARS-H

[@SigmaSheepdog]

@@colkilgore9973 I happen to have both the SR-25 and the LMT H models, but you don't have a choice with either. I also have an AR-10 without dual ejectors and it runs very well without them.

[@CorkScrewDood]

​@@SigmaSheepdogGood for you bud

[@arten]

I think this explains an issue I used to have with my AR-15 in 300 Blackout. I use one of the JP Silent Buffer options in it, and I had that turned all the way down in terms on spring and weight, and I couldn't get subsonic rounds to lock the bolt back on empty. Just the tiniest bit too little push on it. I solved the problem by drilling the gas port a little larger. But I bet the actual, original issue, was that I was using a dual-ejector bolt and I didn't think of checking with a single-ejector bolt. The gun works great as-is, after the work I did on it, but now I think maybe I should test a part-for-part duplicate except for the bolt. I wonder if that would make the difference so I don't have to use a drill on the barrel. I've never been comfortable with drilling on there, since the chance of raising a spur into the inside always exists. And that's not easy to fix (so far as I know).

[@scark00]

Question: Do the ejector springs have different tension compared to a single ejector? Or are they the same spring as a single? It would seem to me that could be the issue with the buffer springs.

[@OFFICIALUND]

Probably depends on the manufacturer.

[@theuncouthtruth9551]

I avoided them because even if one of the two ejectors failed, would this not cause ejection of the case at a different angle? Possibly resulting in FTE? Just seems to me that dual ejectors is trying to solve an issue that doesn’t exist IMO. I do love the carrier though. 👌🏻

[@clutchcargo1239]

Another short video that I found to be educational. I love these videos. Thank you!

[@adamrodgers2377]

As always, THANK YOU for the knowledge you share with us! I appreciate it so much. I would love to know what you think about the KAK Dual Ejector Bolt and their Carrier with "Sand Cuts" your opinion on any AR or AR parts means alot.

[@TheLordNugget]

Yet another reason to hate when people ask you "which buffer weight is best for my rifle". There's far too many things to be certain without actually seeing the firearm first hand.

[@OFFICIALUND]

And yet, the answer is virtually always "H2". I'm mostly joking, but seriously, H2.

[@ALovelyBunchOfDragonballz]

A5H0 😂

[@SchooloftheAmericanRifle]

@@OFFICIALUND no

[@OFFICIALUND]

@@SchooloftheAmericanRifle Yes. Do the KAC boys now know what they're doing? I mean, we all know Jack L doesn't know anything, but they ship theirs with H2s.

[@TheLordNugget]

@@OFFICIALUND what works for KAC may not work for another. A lot of rifles are overgassed so you can get away with an H2, but others are either properly gassed or undergassed for one reason or another. You cannot just say that an H2 would work in those. Too many factors that go into it.

[@stickfighter1038]

Got a dual ejector bolt for an AP M5 308 which is very reliable. This also works out well because you are already limited on the buffer weight..

[@sethperry1323]

The ejection pattern on dual ejector bolts are beautiful 😍

[@jtlbz]

I have the sand cutter with a v 2 bcg.. Runs perfect in my colt 6940. With factory h buffer...

[@R5RGP]

16" barrel and carbine gas. Your setup is prime for a dual ejector.

[@MJA5]

I have a Colt 6940 and it runs perfect with the Colt BCG and factory spring and buffer. What is all this nonsense?

[@R5RGP]

@@MJA5 the dual ejector is simply to increase performance in the even of a failure. The 6900, 6920, and 6940 are all incredibly reliable and dont necessary need dual electors. However out of all the AR-15s on the market they could actually use this feature better due to how a 16" AR with carbine gas performs.

[@Scott-pr9qg]

Was having alot of pierced and blown orimers in my 22" Aero M5 6.5 Creedmoore and had to swap bolts. At the time covid was in fukl swing and very few components were available so i settled on a Toolcraft duel ejector bcg with a hp bolt (reduced diameter firing pin/hole). Fixed the pierced primer issues immediately and has the rifle functioning flawlessly. Was pleasantly surprised with how well it actually smoothed out the cycling of the system in general. Great and informative video as always Thank you.

[@OFFICIALUND]

It's spelled "Creedmoor".

[@tainoblood4680]

⁠did I spell dumass correctly

[@OFFICIALUND]

@@tainoblood4680 Nope. Leave it to someone who undoubtedly thinks they understand the world (and politics, no doubt) to react to being corrected on something they should have known how to spell by calling names.

[@MJA5]

@@tainoblood4680yes, that’s the French spelling

[@jason2800]

Great video, very informative. I could be 100% wrong but this seems like a solution looking for a problem...

[@OFFICIALUND]

Knights Armament and the British Special Forces would disagree (Please don't read that as me endorsing KAC. Although I have an SR-15, I despise them). But, a bunch of AR10 builders have been doing this for awhile, so it's not exactly a new concept.

[@ALovelyBunchOfDragonballz]

For 99.9% of situations it is. It's useful sometimes, but for AR15s just get a quality bolt and/or source quality ejector springs.

[@lb3boone536]

Chad is a national treasure.

[@pdlane43]

Requiring less buffer mass of spring sounds like a desirable outcome, but it is probably not sufficiently predictable to justify the cost.

[@AndyE30]

What about the "lobster tail" dual spring extractors?

[@bradborgelt60]

I would love to try out the LMT with altered cam profile. But in over 30 years operating AR I failed to know this was ever a issue.

[@armorers_wrench]

I haven't ever found this to be necessary. A single ejector works fine in all of my machines. I would like to have a sand cutter carrier but I haven't ever needed that either. I am currently trying a chromed Microbest bcg in a suppressed 11.5 build. So far so good.

[@yupyup4209]

Dual ejectors are best for AR10 style rifles.

[@jcraigshelton]

What’s an “AR10 style rifle”? The only AR-10s I know of are made by Armalite. Are you meaning AR platform rifles chambered in 7.62 NATO?

[@yupyup4209]

@@jcraigshelton im not gonna type that out every time I want to refer to them. I really should of just said AR-10s

[@xCrimsonxTidex]

@@yupyup4209I think I can safely say that I speak for most and we obviously knew what you meant.

[@PacificRecon]

​@@jcraigsheltonNobody thinks you're smart when you're pedantic like this

[@beenschmokin]

​@@jcraigsheltonAgreed. Wonder if it takes clips too 🤔 My statement to all these folks - You're not smarter than Eugene Stoner.

[@hopewilliams6705]

Thank you I'm glad someone knowledgeable is giving their take. I have wondered about getting one for my AR 308 but was curious if there were actually benefits

[@waterishdrake8693]

I don’t personally see the benefit. You don’t have dual extractors? Or dual firing pins? What if the extractor breaks? It would be more beneficial to have a spare BCG in your pack in case anything fails.

[@clayton5584]

Sounds like a gimmick they can charge more $ for

[@flopus7]

Depends on what you're doing. Few things in guns are always better than something else. Always situation dependent

[@kilroy5166]

Yeah in my experience most failures to eject come from a problem with the extractor anyways.

[@aliceburte9278]

Thank You sir always enjoy your listening 👍🇺🇸

[@G5Hohn]

I bought my Toolcraft in spite of it having dual ejectors. It’s their version of the JP “high pressure” bolt for large frame ARs and works well with my .308. Tubb 42 coil spring and an H3 carbine buffer (A5 extension).

[@ekfinn]

Those look like the Centurion sand cutter carriers. I’ve been waiting for a month of Sundays to get my hands on that unobtainium.

[@srummell126]

in stock right now at Revial defense.

[@ekfinn]

@@srummell126Rock on.

[@0num4]

Instead of decreased buffer spring/weight, could you use a lighter weight bolt carrier to offset the difference? Thanks for the vid! I really enjoy how, rather than just saying "this is good" or "this is bad", you highlight the advantages and disadvantages of a choice. Everything is a tradeoff.

[@Semiautoautomatic_shaman]

This is really really good to know considering I just purchased one of these so thank you very much for posting this video 🍻

[@anon-means-anon]

I'll stick with a single ejector. I keep an extra bolt in my kit anyway, and quite a bit of material has to be removed to cram the second in there.

[@misterdeedeedee]

I feel like on a dual ejector, if one ejector fails for whatever reason you're still going to have ejection issues or failures since the ejectors are not 90° across from the extractor so it's going to be pushing that brass either more upwards or downwards at the edges of the ejection port rather than the center. however I would hope something like that was taken into consideration and the specific offsets they picked for the dual ejectors would mitigate that.

[@SciRado]

If it's not broke, don't fix it... Murphy's law.

[@MJA5]

I won’t pretend to be an expert on anything, but I am wondering who is having issues on a 5.56 rifle that would require this divergence from the original design language. I’ll pay for superior material science, but more moving parts? Pass.

[@martinswiney2192]

Seems like regular maintenance and inspection makes the need for dual ejectors a non issue. Also since both ejectors are going to be of the same material and quality when one fails the other is likely to be very close to failing since they both have the same number of shots fired. So double a problem that is not really a problem.

[@TacticalToolbox]

Love me some SOTAR videos

[@unclebob540i3]

This one was VERY educational. Thank you.

[@Animo2006]

Somewhat unrelated issue, I have an Alexander Arms 50 beowulf that has an extraordinarily hard time feeding. More often than not, when I load up a 7 round magazine, I'll get a round stuck at the edge of the chamber after firing about 2-3 rounds. I've tried bending the feed lips on my magazines so that the rounds are at a bit of a higher angle to prevent this, but keep running into the same issue with all ammo with the exception hard cast bullets. All of my underwood ammo misfeeds and gets stuck right at the chamber. (Which, as you can imagine, is an expensive issue when you have hundreds of rounds of the stuff). I had feeding and extraction issues with the gun before this that were unrelated that I managed to fix with different buffer weights, magazines and went through two brand new bolts straight from the manufacturer. I love this gun and I don't want to give up on it, but man, you can only spend so much money trying to fix an issue you weren't aware was common until after buying the rifle.

[@rmblwgn]

Does it feed 100% when cycling by hand

[@Animo2006]

@@rmblwgn Is your meaning to say if I lock the bolt to the rear and put a round in the chamber?

[@rmblwgn]

@@Animo2006 correct. If it does then you have a gas or bolt carrier problem not a feeding issue

[@Animo2006]

@@rmblwgn I don't think that's the issue. As I stated, I replaced the bolt multiple times. I also swapped the buffer weights multiple times as well to fix an ejection issue. It hand loads fine, UNTIL you get to halfway or so through a magazine, when there is less spring tension on the rounds in the magazine so the rounds aren't angled upwards as aggressively. I've tried many different magazines and they all suffer from the same issue. I'm most suspect of the feed ramp being the issue.

[@hexguerilla8344]

Never knew that they reduce bolt carrier speed. Thanks for that!

[@Lauterbach24]

Sounds like the dual point system setups on some muscle cars back in the late 60s. Less wear theoretically, but unless you are racing, what's the benefit? More parts and more things to go wrong.

[@Frankypunpun]

I have them for creedmore and .308 as they use the same bolt face, I was advised and tried simply removing the ejectors and trimming a coil or 2 off of the ejector springs and w a little experimentation found that for me that seems to work. I don’t know if that is the best gunsmithing advise but found it works, mainly needed in my case on .the 308 end of things. It is a little tedious and may advise having a few extra coil pins for the ejectors since you may have to to disassemble/reassemble a few times to determine how many coils need to be removed. Main reminder, Don’t trim more than 1 or2 coil s per adjustment attempt and also trim the equal amounts needed on each spring not one having been trimmed more than the other. Again baby steps, don’t just start cutting numerous off per cut. Worked for me, may or may not for everyone else.

[@OFFICIALUND]

It's spelled "Creedmoor".

[@beenschmokin]

If you've gotta customize it then it's trash and trust Eugene Stoner.

[@michaelfrangoudakis823]

Do the ejectors themselves use a reduced spring rate since there are two of them?

[@iseeyou8781]

Appreciate the video. I didn’t know there was such a thing. Now I know. 👍

[@HB-kp6rl]

Short and sweet. Thanks

[@buddyx471]

Could you please do a Bolt autopsy of the CDNN no name bolt carrier groups, they say they are mi spec….😮

[@CHOPPASLUGBM]

Would love to see your overall thoughts on a complete KAK Industry rifle. They are pushing these dual ejector BCG's heavy right now.

[@mr.lovell3645]

Awesome 👍🤠

[@antoninolatorre8355]

hi, to you ‼️ i think that two ejectors are enough too because they grow difficulties to locking the bolt ... when chambering a fresh cartiridge bye bye

[@MisplacedCHEE]

Really interesting point on requiring more energy to unlock with two extractors, would this theoretically help reduce gassiness from a suppressor given a further delay in unlocking?

[@joemorris6465]

I was wondering about that too

[@code_red7744]

Not to mention that may help how loud it is at the port for the shooter… I watched one video a guys BCM was ejecting at 1:30 with standard bolt and he was at 3:30-4:00 with the dual ejectors.

[@KeterMalkuth]

​@@code_red7744While it may reduce port pop specifically, I couldn't tell you, the bigger issue is that an AR can never get below about 130 DB at the shooters ear, just because the bolt slamming home is about that loud. A dialed in .300 BLK setup can manage nearly the same volume, but regardless it'll be too loud to "safely" shoot without earpro with any consistency. The bigger advantage if one existed would probably be reducing the toxicity risk, IMO.

[@BullseyeBallistics-kf1jw]

Never used them. Never will.

[@onpsxmember]

Does it create more wear on the cases? Does it speed up ejection and is used to fix a shorter time window to eject? Please do a video on cam bolt contact with the upper, solutions that are sold and at what round count that would be an issue at all. Some hold the cam, some add a roller (POF)...any elegant solutions that keep things compatible? Can one draw helpful information from cutting into a buffer tube to see the action or having a clear one? Would make for a great video if there is merit in it.

[@NarsilsBane]

I just got a Centurion Arms V2 BCG for my birthday. I typically run an H2 buffer, I might pickup an H1 just in case I have any issues. Thanks for the heads up!

[@jakeford2324]

I just recently tried the Centurion bolt. On the same set up I normally ran a springco blue and H2, I ended up having to use a standard buffer, and spring. With the heavier buffer the I was getting ALOT of brass shavings in the receiver, went away with the lighter spring and buffer.

[@NarsilsBane]

@@jakeford2324 good to know thanks

[@arnaldobertoli9566]

I was hoping you had done a video on this same bcg from KAK for the gases that get directed to the magazine. Can u make a video on that or a physical on those bcg?

[@mikesword9339]

Thanks Chad! As always great info!

[@Sman7290]

How much does a dual ejector bolt increase the likelihood of ripping a case head apart due to the additional lateral pressure and the requirement for the gun to be more heavily gassed?

[@AndrewDasilvaPLT]

I'm really curious what you think of the bolt carriers that direct gas down instead of traditional direction for use with left handers or suppressor users.

[@12121212smoke]

lefty down vent user here. It's not hype, the ports down venting has made a massive difference for me. My MK18 is paired with a Radian SL and KAK BCG and I get no gas to the face, even at an indoor range. As far as the longevity of the BCG, I can't speak to that.

[@malcolmpalm]

Roger this, and thank you, sir.

[@mikesuch9021]

If one is good too must be better!

[@jdard5308]

Thank you for the insight !

[@nexthubbins]

❤❤❤❤liked n commented 🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉

[@FDCNC]

The make sense for over gassed guns when suppressed.

[@X-ForceBro]

So probably additional cam penware would be my number one concern

[@evanharnois8686]

I haven’t read too far into the comments, but, could a dual ejector be better because it puts more equal pressure on the cartridge when chambered?

[@jaydanbaker123]

Interesting concept, but what are the statistics on failures with 1 ejector vs 2?

[@evox786]

If you switch to a lighter buffer, could this cause issues with the bolt going into battery? The bolt now has to overcome twice as much spring pressure in order to fully seat the round, and a lighter buffer would only exacerbate the problem.

[@joelatkinson2080]

Another great video!!!

[@RewardedRocki]

Any chance of a video on the new Centurion bolts? They are supposed to be stronger but I can't really tell a difference besides the ejectors.

[@Masrafi]

i wonder if adding a suppressor would also accomplish the same thing as more force to the dual ejectors vs stepping down on the buffer

[@Gunner-73]

Couldn't you just increase the gas with an adjustable gas block ?

[@mobilemechmantim773]

No.

[@SigmundPimpulopis]

Thank you

[@danielblackburn4626]

I prefer the Sprinco Silicon Chrome Ejector spring, much more reliable with out the excess force of a double.

[@mr_trigga-time]

Is there any added benefit to having a dual ejector bolt on a suppressed rifle vs an unsuppressed one?

[@eric1138]

Works great on my Daniel Defense DD5 v4 308.

[@wculshaw1576]

They’re for those red locktite filled primers

[@Unknown-kq8ro]

What if you're running suppressed? Would you still need the lighter back end?

[@chuboiandrew]

Can we talk about ejection pattern? With single i was about 2/3 o clock. With duals i was about 4/5 o clock. My only thoughts was it was double the force extracting the round?

[@steveninaz9576]

Thank you Sir

[@steveparks5030]

And the military uses what bolt in full auto rifles? Not dual ejector bolts.

[@Thoroughly_Wet]

That's why you inspect your gear on a regular schedule and catch this shit before it can fail

[@immutablecantrip]

Can you do a KAK K-Spec down venting video?

[@TweakRacer]

Need dual extractor bolt 😂

[@mmelgoza1983]

Would you say the bolt as a whole is weaker with another hole machined into it?

[@Xtroll1738]

Can someone please list other firearms that have 2 ejectors because I know of none. Being all the firearms I know of have only one 1 ejector and they all work pretty well, I'm thinking this really isn't needed. Most of the reasons he lists for needing 2 ejectors with the AR could happen with most firearms. Also I think there are other more common problems with BCGs than ejectors which is why if I were going into any situation where I may need to use my AR for an extended amount of time, I'm going to have an extra BCG with me which will cover any BCG problem.

[@Otis884]

👍Always good info.

[@ALovelyBunchOfDragonballz]

Ive never seen a reason for dual ejectors on a 5.56 rifle. AR10s and longer (like the Nemo) i can definetly see a purpose though.

[@AC-bl1rl]

Can they affect accuracy? More force pushing the round at an angle in the chamber?

[@bills6946]

After you install that bolt, now you have to tinker with the buffer weight and spring. Oops. Still not right. I know. An adjustable gas block. Wait. It must be the ammo. If it ain’t broke, don’t fix it.

[@danielhess39]

Thank you!!

[@jamesbullock3259]

Interesting, thank you

[@snakeman48]

I've seen dual ejector bolts on AR10 BCG guns. Never knew they were available for the AR15 BCG. A solution looking for a problem on an AR15?

[@34ccsn]

How do dual electors effect subsonic loads in 300 blk. ?

[@Charles_Gunhaver]

Okay but what about three ejectors???

[@aaronevans8717]

My sig 716 dual ejector operates terribly. So Much side pressure on shell it binds when the bolt rotates and causes friction and failures.

[@cjanquart]

Fair questions: are their any dimensional changes to the carrier itself, or just the bolt with an additional ejector? Can you install a "normal" single ejector bolt into that carrier?

[@SchooloftheAmericanRifle]

The Centurion Sand Cut Carrier takes standard AR Bolts.

[@denishp1985]

Does the dual ejector change the extraction pattern of the brass? Can you use the same extraction pattern to check for overgased system with the dual ejector bolt?

[@SchooloftheAmericanRifle]

The ejection pattern is not as important as most people think it is. Consistency with ejected cases and ejection authority is what's most important. Marks in the brass mean more than the direction the brass goes.