Suppressors Gas guns and suppressors

[ZLBubba]

As I research my next build, I'm realizing that running a suppressor on each of my rigs is a bit more complicated than I imagine. Initially, I wanted to run the same suppressor on my 5.56 SBR, my 308 gas gun, and my 308 bolt gun.

What I didn't realize is the vast difference in back pressure between the gas guns and the bolt gun. Obviously the gas guns use of the expanding gases to cycle the bolt, but I didn't realize how much I'd be changing the cycling equation with a suppressor.

It appears that as I'm tweaking my builds right now, I need to make sure to have adjustable gas blocks or else I run the risk of vastly overgassing my rifles and causing malfunctions or undue wear and tear on them.

Are my assumptions correct and will having an adjustable gas system most likely ensure proper functioning of my weapons with and without a suppressor? Thanks for your help.

 

[sinister]

Re: Gas guns and suppressors

You can use either an adjustable gas block or a heavier buffer and carrier weights.

Not really difficult nor expensive.

 

[RollingThunder51]

Re: Gas guns and suppressors

..

Good of you to know the difference!

sinister is absolutely right. I would, however, try to choose low pressure, front purging, cans where possible as, IMO, that is the future and they work best of gas guns.

 

[ZLBubba]

Re: Gas guns and suppressors

Is there an advantage to either route? Does adding both make for overkill? I would assume that having an adjustable gas block makes it easier to switch between suppressed and unsuppressed fire since removing the carrier weights and buffer would require more time.

 

[RollingThunder51]

Re: Gas guns and suppressors

sinister has it right.

Your first step is to finalize the platform and then the solution is relatively easy to dial in. The vast majority of current gas guns require very little, if any, work.

Here:

5.56 SBR,
308 gas gun
308 bolt

depending on what they are the SBR is already overbore so little will change. The bolt gun will not require a thing....that just leaves us with the question of what is your gas gun? Are you a 16" POF 308 guy? If so, you buy the right can for that rifle and your done. In fact, I would go with a can that can take 300 WM as the extra baffle set and chamber will only help and provide you with some down the road readiness and, to a degree, help with what I'm about to tell you.

Your going titanium. Just know that the .223 is one of the hardest calibers to supress properly. There are those that say that a .30 can (especially one with a little extra envelope volume/baffle) will do just fine. Honestly? Its "good" but not really superb. Mark my words, no can will disappoint more than a .223, and on an SBR it is almost a given. The .223, especially on the SBR, requires a tight bore can and even then it is a tough one. You should go thread on (QD cans by design have to allow for more interface slop, called "megaphone" bore") and this works against you with an SBR. That SBR blast comes fast and hard into the diffuser. Are you going FA? With most cans, not all, you will be left with essentially a moderator's performance (8",10".) Just be realistic and for goodness sake hear whatever you chose to buy on all three platforms first.

Good luck.

 

[ZLBubba]

Re: Gas guns and suppressors

PM sent, RT51

 

[TheGoodDoctor]

Re: Gas guns and suppressors

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sinister</div><div class="ubbcode-body">You can use either an adjustable gas block or a heavier buffer and carrier weights.

Not really difficult nor expensive. </div></div>

Both of these will help with wear and tear but suppressors will always make your guns dirty as hell due to the gas and debris that is forced back down the barrel due to the back pressure from the can.

 

[zepheris.hk]

Re: Gas guns and suppressors

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: The Good Doctor</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sinister</div><div class="ubbcode-body">You can use either an adjustable gas block or a heavier buffer and carrier weights.

Not really difficult nor expensive. </div></div>

Both of these will help with wear and tear but suppressors will always make your guns dirty as hell due to the gas and debris that is forced back down the barrel due to the back pressure from the can. </div></div>

Agreed. I love shooting with a can on my DI .223 SBR, but boy does it make it filthy in the receiver.

 

[TheGoodDoctor]

Re: Gas guns and suppressors

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DFOOSKING</div><div class="ubbcode-body">Question in regards to the adjustable gas block and size of can in terms of performance. What would you recommend to do if I have a 30 cal can but no want to shoot subsonic rounds?

I have my .204 bolt gun set up for my 30 cal can and love having it hearing safe. Would like my RRA LAR-15 done as well. Are the modifications necessary for shooting full speed ammo only? </div></div>

You can use a .30 can on most any caliber gun that is smaller with no problem but you might want to ask the manufactuer about a specific load. Most cans are rater for certain pressures. ie. do not use a regular 30 cal can on a 300 WM.

 

[BigDTexas68]

Re: Gas guns and suppressors

I use a TBAC 30P 1 on my 308 bolt gun and AR. Had an issue with the gas block on the AR fitting under the handguard and went with an adjustable gas tube. Can works great on the bolt gun. I have had a few of issues with the AR with almost 400 hundred rounds. Set the gas tube without the can at first. Ran the can afterwards without any adjustments to the tube. Dumb luck I guess. ARs in 308 caliber are just a little harder to tweek period. More so when using a can. No easy fix. Each rifle is going to be a little different but whether get an adjustable gas block or tube it is definetly going to help.