Radial Delayed Blowback - A Closer Look 

It's surprising for sure. You wonder why a 9mm has more recoil than a rifle round 🤯

​​​@CMMG Newton's 2nd and 3rd laws and greater bullet mass? Although that wouldn't apply specifically to 9mm, 10mm and .45 ACP do end up having more muzzle momentum than 5.56 NATO. In my experience with 3 PCCs and an 8" Banshee in 9mm, all of them had a softer recoil impulse than my AR-15 in 5.56. I will say that despite having half the barrel length and marginally less weight, the Banshee shoots the softest.

Did you get it already??

Correct. The bolt and chamber do all the work

The barrel nut varies depending on what handguard you plan to use but the thread is standardized. The CMMG RDB system will use any AR barrel nut. I used the ones that came with my railed FF handguards.

No rifle powered rounds will not work

@@corvoattano4777 According to the Spanish, French, Germans and many other's, that is not a correct statement.

@@christopherfisher128 radial delayed blowback system has bene used before? In rifles?

@@corvoattano4777 Not specifically Radial but roller and delayed blow back of a couple other designs as well. The G3 is a roller delay.

@@christopherfisher128 comparing one type of system to another doesn't work m There is a video comparing mp5 with cmmg 9mm in slow mo and cmmg has significantly more recoil compared to mp5. Also even the roller delayed blowback in something like 762x51 kicks like a mule not as smooth as gas operated system. And radial delayed probably won't even work with 5.56mm only for pistol calibers

Not sure what you’re seeing but the bolt is definitely rotating.

The backorder line is real, I ordered from them back in Nov.....still waiting...good luck👍

@@Nathan0486 it'll come when it comes. Pandemic, lack of leadership from a fractured government to worried about itself to actually lead, and local governments allowing their areas to become areas without rule of law have triggered a panic and more folks than ever have realized the only people they can depend on for their own safety is themselves. Makes for a long line. 🙂

K&M tactical had them in stock

I just hope mine actually gets here before they’re banned lol.

No point. This system is designed to bring some of the advantages of the gas system to blowback guns. 5.56 AR-15s are not blowback, and that's a good thing since the barrel pressures of modern rifle rounds are too great to allow use of a blowback system. AR-10/15/18, AK 47/74, AUG, and any other reasonably powerful semi-auto rifle since the M1 Garand has used a gas system, which delays bolt reciprocation at least as long as the DRB system portrayed in this video, and the reciprocating force is regulated by the length and aperture width of the gas tube. The DRB system in the video uses resistance in the breech lug to delay blowback, which may see reduced efficacy as that resistance gives way to wear of contact surfaces. Since the bolt of a gas rifle like an AR-15 is totally locked until the gas system unlocks it, there should be less wear by comparison. In short, the existing AR gas system is already better, and implementing a blowback system, even if radially delayed would be a bad idea. Probably catastrophic, actually. Hope this helps.

If you want a delayed blowback 5.56, there are the HK33 rifles...

Think of it like like a screw, it takes longer to move because it has to rotate. Normal blowbacks are like a nail, moving straight back. Because it takes longer to move at first, the bullet has time to exit the barrel and the pressure drops causing less pressure to push the bolt back.

I think most rifle-round systems in the AR are all gass-blowback designs. Would be interesting if they could make a radial delayed that would survive the higher impact of the rifle rounds. :)

Ya I asked them about .300 blk cmmg said no go

@@ShadowRhapsody81 I don’t think it’s a matter of surviving, the bolt on an AR is a very similar design after all, it’s probably more an issue of slowing down the bolt enough.

Probably yes, afteral G3 and FAMAS work on a similar principle, but you would need a fluted chamber or waxed cases of the cartridges to work reliably.

It's not a gas key exactly. It is there to help keep the BCG aligned in the upper, and is blocked off on the front to prevent it from being inserted into a firearm with a gas tube.

@@CMMG Thank you for the clarification, Mr. CMMG!

Depends on the verzion. The 9, 45, and 10mm are all bespoke top/bottom matching settups. The 5.7x28 though, they offer in both matching top/bottom that uses fn magazines, and a "conversion kit" with custom magazines that works with any mspec m4 lower.

@@ShadowRhapsody81 i meant like a stripped lower and upper, putting the gun together from a parts kit.

@@James-cr5mc ahh that. Looks like they have a bit of everything on their website, from full part kits, to triggers/grips. Cmmg.com :)

@@ShadowRhapsody81 awesome. To me buying a few parts at a time is like layaway so it helps me get more guns

@@ShadowRhapsody81 You can, for example, switch the 9mm upper between Glock-magazine and AR-magazine lowers, assuming the AR magazine has the 9mm follower/spring kit installed. Personally, I like using the AR lower better, as the magazines feed a bit more reliably.

Both, they offer versions in both of those calibers.

We didn't claim that it locks. It does rotate in the barrel extension as shown, and the barrel extension engages with the chamfered lugs of the bolt. That little bit of rotation is what delays the action.

@@CMMG You don't claim it locks. Everyone else that buys it and tries to explain it says that it locks. And all of the animations I've seen show it locking. They show the carrier moving before there is any movement in the bolt. I think everyone is taking an animation of an AR15 bolt and carrier, modifying the picture to show the wedge shape on what is normally the locking lugs, then playing the animation. Obviously you know it doesn't lock. You designed it. I am curious if you ever tried a gas delayed blowback system like on the HK P7? I know you've tried gas operated, but did you try gas delay?

Going on 23 weeks for me, what about you?

"fix your backorder" LMAO nice 👌

@@greatmtnclimber2579 22 weeks here.... Frustrating....

Move out there and volunteer to help the production team?

@@ShadowRhapsody81 if their paying good money hell yeah ill go build rifles