People mostly talk about how these are smoother than blowback designs. Does the delayed unlocking of the bolt make them noticably quieter when using a suppressor? My blowback 9mm uses a proprietary buffer and spring, so it's not readily tunable.
Suppressors CMMG RDB Suppressed
- Thread starter CountryShooter
- Start date
In regards to keeping rounds subsonic? I reload so it shouldn't be a big deal. Do factory 147s go supersonic between 5 and 8"?
Thanks for the info. I've been reloading 9mm for a long time now but as cheap as ammo is I've considered just buying in bulk. I'll definitely try some before I buy 1k rounds of anything. Just got my first pistol can recently and found the load I've been using for years with 147s won't cycle 100% with the can, need to bump it up a bit.
-Dan
The propellant they use and they amount consistently dispensed is a problem. Keep in mind some of this subsonic stuff is 750fps-850fps in a 5” barrel and other stuff is 1000fps to 1025fps in the same 5” barrel. Bump the barrel length up to 8” and some will and can go supersonic on you. Sometimes they all will. Sometimes its random rounds. The worst is random rounds....
The similarities to your 5.56 11.5” are only aesthetic. How pretty everything needs to look in the safe. The fact that a 9mm or 45acp pcc have the same ergos is nice for us with a lot of muscle memory. Its a bonus when the desire to run a pcc pops up. But the idea of using a pcc to mimic training of the 5.56 gun does not remotely pan out. Its not cheaper practice.
The similarities to your 5.56 11.5” are only aesthetic. How pretty everything needs to look in the safe. The fact that a 9mm or 45acp pcc have the same ergos is nice for us with a lot of muscle memory. Its a bonus when the desire to run a pcc pops up. But the idea of using a pcc to mimic training of the 5.56 gun does not remotely pan out. Its not cheaper practice.
I can shoot my steel from pretty close range without worry and the weight and balance are going to be similar. Not to mention the cost to shoot. I can pump out 9mm on the Dillon really quickly. 556 takes more effort and money. That's my main reason. A 9mm carbine has no practical purpose for me other than a range toy and cheap close range practice. Honestly a direct blowback would probably be a better choice since the recoil is at least as much as 556, but I just can't bring myself to put one together. With the RDB upper I should be able to use my SBR lower with no mods.
Ahhh, thanks for the clarification. My PCC has a 6-1/2" barrel. I've stacked Blazer AL case 147s and they are definitely subsonic.
I have a CMMG Banshee 9mm that I run with a Hybrid 46 w/9mm Endcap. I don't have a lot of direct comparisons with other suppressed 9mm ARs but its noticeably more quiet than a 300 blackout running subs w/ the same Can. Also, at the shooters ear its seems quieter and less recoil than a ruger PC 9mm carbine that I tried the Hybrid can on. The RDB system seems to really smooth out the recoil impulse vs a straight blowback design.
I don't worry about "training" with anything except my carry pistol. Rifles and PCC are for fun. My AR15 destroys my steel targets, so I've almost completely gone to shooting 9mm. And it's a lot cheaper. And it suppressed better. Based on how many 9mm rounds I shot last year, I saved about $1700 over buying the cheapest bulk .223. And my steel targets are still GTG.
