9mm AR gas in face with suppressor; worse with short or long barrels?

[FourTeeFive]

I'm just curious if anyone here has experience with both long and short barrel suppressed pistol-caliber ARs. I've heard about the "gas in face" issue and was wondering if it is worse with a pistol barrel or carbine barrel?

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[Member 34319]

Worse with direct blowback.

 

[FourTeeFive]

Worse with direct blowback.

Yes, these are 9mm direct-blowback guns. Building up a carbine and a pistol and wondering which will be worst for "gas in the face" issues when using a suppressor.

 

[Member 34319]

Yes, these are 9mm direct-blowback guns. Building up a carbine and a pistol and wondering which will be worst for "gas in the face" issues when using a suppressor.

The shorter the barrel, the more overall gas to capture, cool and release.

So yes, the pistol, may be more gassy!

 

[FourTeeFive]

That's what I needed to know. Thank you very much!

The shorter the barrel, the more overall gas to capture, cool and release.

So yes, the pistol, may be more gassy!

 

[cooper]

Pistol big gas....
THEY ARE EXPENSIVE, THAT SUCKS
BUY A PRI GAS BUSTER CH. ELIMINATE THE BURNT WINCE EXPERIENCE. $85.00
LAST FOREVER SHOOTING ROCKS
I HAVE YET TO MAKE ONE SLOPPY

 

[drstrangelove]

Easiest solution is titegroup powder, 147gr seeds, 45cal suppressor; no blowback yet. The gas buster CH might help but the easier and cleaner solution is what I mentioned. I ran my 300blk full auto suppressed with a class 3 buddy and while everything worked great, the inside of my AR pistol was the filthiest mess I've ever seen. The suppressor was a horror to clean.

 

[Nosferatu]

It's the biggest problem with guns that sh!t where they eat.

An adjustable gas block and suppressor optimized charging handle can mitigate this problem to an extent, but a low-blowback suppressor is your best defense.

 

[Burt Gummer]

Have both. When using clean suppressor ammo 145+gran the smoke isn't bad at all. Has a lot to do with what ammo you use.

The worse idea I had was threading and suppressing a Carbine 30. Three shots and I was almost blind. Took me 3-4 months to get it threaded and 3-4 mins to see it was a fail.

 

[Nwcid]

It's the biggest problem with guns that sh!t where they eat.

An adjustable gas block and suppressor optimized charging handle can mitigate this problem to an extent, but a low-blowback suppressor is your best defense.

What gas block are you running on a 9mm?

 

[Nosferatu]

What gas block are you running on a 9mm?

I have no use for 9mm.

 

[Nwcid]

I'm just curious if anyone here has experience with both long and short barrel suppressed pistol-caliber ARs. I've heard about the "gas in face" issue and was wondering if it is worse with a pistol barrel or carbine barrel?

I have a 9mm AR that uses Glock mags. It has a 6.5" barrel with an integral SRT silencer on it. I run 115gr bullets over Titegroup (I will have to look at my load book, but I think 3.5gr).

I have never had a gas issue. Then again I have not on any of my silenced guns.

 

[Deavis]

Have both. When using clean suppressor ammo 145+gran the smoke isn't bad at all. Has a lot to do with what ammo you use.

The worse idea I had was threading and suppressing a Carbine 30. Three shots and I was almost blind. Took me 3-4 months to get it threaded and 3-4 mins to see it was a fail.

100% my .30 Carbine suppressed experience.

 

[Wombat of Doom]

100% my .30 Carbine suppressed experience.

I have debated doing a 30 carbine suppressed. Never enough to chop up an m1 carbine, but I wonder if with different powders it would be different. Then again, that is kind of a wide open area for gas to vent.

The taccom3g magnetic delayed blowback does help gas a bit on a direct blowback 9mm. Titegroup helps more. My 4.5 inch sbr which is rh and I shoot lh is very tolerable suppressed with Titegroup

 

[Deavis]

I have debated doing a 30 carbine suppressed. Never enough to chop up an m1 carbine, but I wonder if with different powders it would be different. Then again, that is kind of a wide open area for gas to vent.

The taccom3g magnetic delayed blowback does help gas a bit on a direct blowback 9mm. Titegroup helps more. My 4.5 inch sbr which is rh and I shoot lh is very tolerable suppressed with Titegroup

I SBR'ed a repro and threaded it. It is against my religion to mutilate a proper mil-surp.

.30 carbine is one of the few rounds I dont load for.

 

[Ops]

i dont notice gas to the face

 

[Wombat of Doom]

I SBR'ed a repro and threaded it. It is against my religion to mutilate a proper mil-surp.

.30 carbine is one of the few rounds I dont load for.

Its an easy one to load for. (and tite group has loads for it which would likely be very low on gas.
I have one that a company that made receivers and assembled them out of parts kits made. So it is a mostly mil surpish. I guess it hasn't ever been a priority as I suppress all the other guns.

 

[montero4X4]

Get the CMMG RDB bolt and barrel. Runs a lot quieter and minimal gas to face with a 5" 9mm AR