Maxim Roller Delay Buffer: How does it work?

[@BrianSmith-kv3px]

Seriously considering this for my NFA C9 build now. Thanks, BB9!

[@SS-tr5ru]

Maxim defense is extremely underrated as a company

[@stevegillespie6424]

I gotta give it a try. I have a 16" home build, and a Saint Victor 9mm. Excited to give it a go in both. Thanks for all the info regarding this.

[@stevegillespie6424]

So, holy crap! Until you have one of these installed, it is hard to quantify how much effort it takes to run the charging handle. YIKES!!! The effort needed is boarder line absurd. That's my initial installation, unfired preliminary observation.

[@abitnutz6747]

@@stevegillespie6424 It's true, it's a beast to charge but I think it's worth it. I've ordered a Timbercreek charging handle. It has the largest handle I can find. I'm hoping it helps

[@scott2228]

@@stevegillespie6424good point. I already have a 380 buffer spring in mine. Wonder if it would be heavier or lighter to charge. My AR9 runs amazing but as mentioned in the vid…. There is a lot of weight moving back n forth. Bc I shoot suppressed, I’m also running a 45ACP buffer weight. All this said…. Just shows how important the “last round bolt hold open” feature can be. Only having to charge it once. And not for a reload.

[@ArmyMatt79]

Outstanding video!!!! I'm definitely getting one.

[@mikefields1873]

Thank you for this video, I just order the Maxim RDB last week. I have a Faxon Bolt with removable rear mass via a roll pin. I'm looking forward to seeing how my AR9 performs now.

[@Blowback9]

Good luck - let me know how it goes!

[@mikefields1873]

@@Blowback9 I can definitely say that the recoil impulse of my AR-9 is quite different. Can I claim that the recoil, or the felt recoil, is less... maybe a little. I've always perceived the recoil on my AR-9 to be almost circular, the way the gun fires and then settles. Today at the range, I had a few folks with me who said the same thing. All my AR-15 platforms recoil so differently. I've had this setup for about 3 years now (Aero Precision dedicated AR9, 8.5" barrel) and now today is the first day with the Maxim Defense RDS. So, I'm not entirely sure it was worth the money for what I got out of it, if that makes sense? A few years ago, I've shot some full auto MP5's, but I never took the time to 'feel check' the recoil impulse and how light that platform truly is. When I built the AR9, I was like, 'This thing kicks.' So, in conclusion, yes, it reduces the recoil somewhat and changes the impulse or feeling of how it recoiled before. Is it worth the money? For me, probably not. By the way, I love your channel; thank you for all the info you provide to the community. 👍

[@abitnutz6747]

I installed a Timber Creek Enforcer charging handle on my Maxim Defense Roller Delayed AR9 in hopes of reducing the draw weight. How? Well, the Timber Creek C/H has a much larger handle than almost any other handle I've ever seen. In short, it works. The greater surface area of the Timber Creek lets you spread the load and reduce the apparent weight required to charge the rifle. The downside? It's a much larger handle. I have gorilla hands so I like it...a lot.

[@michael9r9rsBlasters]

Great vid! Thanks for taking the time to explain this.

[@coltonharmon7219]

Good luck getting one…. Mine has been on order from Maxim since June 12.

[@r1dv]

Thanks for explaining. Can't wait for my order to come.

[@apollow_g1025]

dude you are my hero thank you

[@Brian-gj5xm]

I could see thos being used in the KelTec Sub2000 and S&W FPC

[@Steve-xm3mv]

Mine just arrived and I was curious how this worked. You saved me a lot of time. Now what 9mm bolts are best for this? Someone said you can’t use a Aero bolt.

[@Blowback9]

That's correct, the Aero bolt is the wrong design. B. Kings. Firearms has a reasonably priced good quality bolt that will work.

[@bayouromanian]

Excellent video, thanks for sharing!

[@anssi5853]

Thanks i get new ideas for my next built. Roll deley and many types buffer system i know but roller deley buffer wasn't. For hobbies macinest I have to say that it's wery simple wor that needs only lathe wor much easier that eny type bold or barrel.

[@UncleDanBand64]

I wonder how that would fair against +p and or +p+? I finally got my extractor in after blowing it into the next county with Underwood 147gr +p+. I know I said I would stick to +p but, I got an order of Underwood Extreme Defender 90gr +p+. My guess is that round would not have caused the failure that 147 caused. My thought is it would be exiting the barrel so much quicker that the chamber pressure would likely drop to a safe level before the bolt had any substantial reward travel. Kaw Valley Bolt, stock steel weight, carbine spring, 11oz Buffer, 11' Ballistic Advantage barrel.

[@devinwhite104]

ive been wanting to switch to the cmmg radial delayed bolt and barrel this looks like cheaper option i like it

[@E52O4]

This system sounds good for a carbine length firearm. Even though this may reduce the felt recoil on an AR-9 pistol, I’m not sure that the reduction in felt recoil justifies this system over using a heavier buffer/spring combination. My AR-9 set up uses a carbine compatible buffer/ spring combination due to the SBC Tactical SBPDW brace I use. It has given me zero issues in over 1,000 rounds fired (actual number is probably higher, but I stop counting after 1,000 or so). Felt recoil is slightly more then AR-15 carbine, but not appreciably more than an AR-15 pistol IMHO.

[@bensiniff2868]

I just ordered one to test . I'd like to see cycling performance and speed compared to just heavy weights

[@bakedandsteaked]

Great video

[@CodySmoakVideos]

Thank you so much for sharing your knowledge with us. Have you tried this with a suppressor? Any advice you can share about reducing port pop would be greatly appreciated.

[@Blowback9]

I have, and it doesn't seem to make any significant difference. Sorry!

[@Didymus-vz6uy]

Great video. I've got one of these myself, and I really like it. Could you do a review on the TACCOM PPC Adjustable Recoil System? It seems very interesting, Like a hydraulic buffer but using springs instead of hydraulics.

[@Blowback9]

I have a very small budget for testing/reviews, but I'll add it to the list!

[@jpay37]

Excellent video, thank you! In your opinion, if you were starting a 16” build from scratch would you use the roller delay buffer or the gentle recoil system?

[@Blowback9]

I would use the Gentle Recoil System (video coming soon!) It's easier to charge and feels just about as good to me.

[@jpay37]

@@Blowback9 Thank you...and looking forward to that video for sure!

[@RigSMP100]

Do you have a different video that compares the felt recoil between this and your personal gentle recoil system with a different buffer and spring?

[@mjohnson43136]

Very interesting. Would you be able to weigh the reciprocating parts?

[@Blowback9]

Weight of the roller delay mechanism and collar is about 4.3oz. The mechanical delay allows the use of much lighter masses in a blowback. With a 12oz. empty bolt, this would give about 16.3oz. total blowback reciprocating mass.

[@uilim60]

my KP9 runs like a top with the MRD no issues at all.

[@markrippt4677]

Good vid! I wonder how it compares to the Scheel RDB and the Taccom Magnetic Delay?

[@Blowback9]

My tiny little budget is maxed out right now, so I'll have to let other folks do that testing!

[@1DavidMarshall]

Explained very well. Thank you. Just curious how much recoil is muted. As say to the mp5. I have the magnetic delayed blowback buffer from taccom on1 of my ar9 it works well but charging is it a pain

[@GTWGamer]

For the more is better crowd, what if you combined this with the cmmg bolt/barrel combo?

[@justinrush6620]

Thanks for sharing, i think ive been reading all your posts about it on the AR forum? Curious to see someone short stroke it... Seems doable to put a delrin spacer over the main shaft there? Any thoughts?

[@Blowback9]

That may be possible by making the white plastic spacer at the back, longer. I'll have to leave that experiment to other folks!

[@DavidA20200]

This is a really awesome product. I wonder how it would work with the Mean Arms bearing delay upper, basically a double delay. 😂 I have to admit I am kind of curious, especially if you’re suppressing it. Having that extra back pressure and having two delays might really help with the gas to my face. Although I don’t know if it would work having two delays.

[@Blowback9]

It probably wouldn't cycle. Each mechanical delay is designed to dissipate a large part of the recoil energy. There wouln't be enough left over to operate the 2nd mechanical system.

[@abitnutz6747]

I just received my Maxim Roller Delay widget in the mail about 2-hours ago. It looks really well made. It had absolutely no directions with it as to maintenance. I'm wondering should I oil it? Grease it? Leave it dry? massage it and sing to it? Because of the way it works, I'm a little concerned that any lubricant or the wrong lubricant could cause it to malfunction. It arrived completely dry but there is metal on metal contact....inquiring minds want to know.

[@stevegillespie6424]

I just got mine today as well. Zero instructions for lubrication. Nothing saying to lube it, and nothing saying not to. I put some Tetra grease on the ball bearings.

[@Blowback9]

Mine was greased with clear grease. I use a thin coat of bearing grease on all the moving parts.

[@brian.louis107]

It would be interesting to know how much force is needed to separate the two?

[@bayouromanian]

Great information. Thank you for sharing. Would you happen to have an idea of which binary triggers might work with which 9mm ar setups?

[@Blowback9]

Here you go! blowback9.wordpress.com/2021/09/22/franklin-armory-bfsiii-binary-trigger-in-a-9mm-ar-oh-yea/

[@bayouromanian]

@@Blowback9 awesome thanks for sharing. I'm hoping it runs with the roller delay setup.

[@123asap6]

Pair it with a CMMG radial delay bolt and it should give you some unexpected results. Whether that be good or bad will depend on the amount of tuning that goes into the system. Funny enough with both of these delay systems at the same time we might be able to build a pure delayed blowback 5.56.

[@Blowback9]

Check out HK-33, ZF-56, PTR-63.

[@MinutemanMedic]

have you tried that yet? I'm really curious if it would get the CMMG any quieter...

[@123asap6]

@@Blowback9 I meant within a AR15 platform. The HK33 while nice is heavier than the AR15.

[@g.barrett8410]

Could this Maxim RDB work in a full auto Colt 635 9mm smg?

[@caaspal]

Do you think you could let me know how much travel that buffer requires and the diameter of the guide rod? Trying to figure out if it will work on my fix-9 bolt

[@Blowback9]

Guide rod cap screw is 7/16'. The buffer travels about 3.25" on the rod. Total length is 7". Hope that helps.

[@miserylovesshotguns]

How does the recoil compare to a kynshot buffer?

[@Blowback9]

Watch for a video I'm about to publish about the "Gentle Recoil System". Coming soon!

[@campriole5410]

Will it work on a 10 mm setup?

[@walt3r88]

Is it worth the cost? How’s it compare to the cqb version?

[@cypheir]

What's the difference between the CQB and Carbine versions of this system?

[@Blowback9]

CQB is shorter and made for the maxim CQB stock/brace system.

[@jacobcarter6028]

Instead of using weights in the BCG of my Banshee I’m curious how this would work in conjunction with the radial delayed action. The banshee is an 8” and would be suppressed use only

[@Blowback9]

I don't know, but I'll do some checking and see if I can find anyone who's tried it.

[@Blowback9]

Found this - hope it helps: www.ar15.com/forums/ar-15/Maxim-Defense-RDB-review/15-780933/&page=7#i8576440

[@frankhart7757]

Would an FM upper with a forward charging handle give you better leverage to overcome the resistance on the buffer? I really want on of these.

[@miserylovesshotguns]

I was wondering that same thing. I don't like the idea of using a thin piece of polymer to push against that much mass.

[@frankhart7757]

@@miserylovesshotguns Good point. Their paratrooper handle is aluminum though, I may try that.

[@miserylovesshotguns]

@@frankhart7757 how do you get one of those? I'll have to email them and find out.

[@Blowback9]

Reports are mixed. Some say it helps a little, others say it doesn't.

[@jlwinesickle]

Have you tried the Vltor PCC buffer and spring?

[@Blowback9]

I have not, sorry!

[@adamg574]

I’m wondering if this would work in an FX-9. I don’t see why it couldn’t.

[@abitnutz6747]

I just tried the Maxim as it came out of the box. I didn't lube it. It ran perfectly. This thing is really something. I'm shocked. The PCC is as follows: Aero Precision EPC 9 upper & lower. Ballistic Advantage EPC 9 barrel, Hiperfire Elite trigger, Odin Works Enhanced BCG, BCM Enhanced buffer tube, and Cross Machine muzzle brake. This thing has very little recoil. I'm stunned at how well it works. Not one hiccup. It just runs. I just wish I knew where, if, and with what I should lube the buffer widget.

[@Blowback9]

I used standard bearing grease on the bearings and other parts. Seems to run fine with it.

[@From973to904]

Yeah I’d like to know the best way to run this

[@MinutemanMedic]

what would happen if you used it with a CMMG delayed blowback BCG? o

[@Blowback9]

It won't cycle.

[@jdwojda]

what BCG are you using that has the removable weights?

[@Blowback9]

The bolt needs to be full length with a removable steel plug inside the back of the hollow bolt. KVP, B.Kings Firearms, New Frontier Armory, Faxon, and Angstadt Arms are a few made this way.

[@MrKlassiPHIed]

Does it silent the action like the jp silent capture spring does?

[@Blowback9]

Yes, it is quiet.

[@corvoattano4777]

What would happen if you put it into a regular a15 ?

[@Blowback9]

It won't cycle properly. Regular AR-15's are gas operated, not blowback. Completely different operating system.

[@corvoattano4777]

@@Blowback9 lets say the ar15 was overgassed and/or this system was somehow made slightly " lighter ". Lets just say for the sake of the argument the ar15 cycled. Would it reduce recoil ?

[@racktech]

This looks similar to the Armaspec Stealth™ Recoil Spring - SRS™- AR15. Which they have been making for long time now and cost alot less. Great video no doubt Sir .

[@Blowback9]

Looks similar, but this has a mechanical delay inside - very different mechanism. Thanks!

[@jn71000486]

Anyone tried this with a side charger ar9?

[@michaelscroggins1293]

Anyone have experience running this suppressed?

[@Blowback9]

I didn't notice much of a difference, but others have said they thought the port pop was louder.

[@michaelh3992]

Almost seems like they used ball bearings,instead of something else, to call it a roller delay system, ala MP 5.

[@joed3264]

You guys must be really weak.I am 75years old. I have zero issues pulling back a regular charging handle.

[@Blowback9]

That must be it. Lol.

[@0Asterite0]

Looks like the only real downside is it makes the gun harder to charge

[@Blowback9]

Yup!

[@Bromo_Sexual]

It makes the gun more than double harder to charge…