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AR15 and pressure with suppressor

For me personally, skip the gemtech idea... too much work and messy to boot! With a quality AGB, you can just about dial out all of the overgas issues you may encounter. No need for a heavier spring or buffer...
 
The only thing you REALLY need is an adjustable gas block. I use them on every AR I own because most AR barrels are over gassed from the factory. The manufacturers do that to prevent warranty returns when their guns have issues with crappy ammunition.

With an adjustable gas block you can tune it so it feels exactly like it does now with your silencer.

Even if I never plan on shooting with a silencer I use an adjustable gas block. An AR that is tuned is a completely different feeling gun. It reduces felt recoil, the gun runs cleaner, less wear and less gas in the face.
 
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I have two kinds of guns. Ones that I run with and without short low backpressure cans without adjusting anything, and guns with long low backpressure cans and smaller gas ports to compensate. Even it if takes a cut down or custom barrel. It works.
 
I run my AEM5 on 2x 20" rifle length tubes, 1x 18" rifle length tube and one 16" with carbine tube. I don't need to do anything to any of them running carbine or rifle buffer systems with GI bolts and a variety of gas blocks, none adjustable.

Have you shot it to see if there's actually a problem or are you just going stir crazy under house arrest ?
 
I run my AEM5 on 2x 20" rifle length tubes, 1x 18" rifle length tube and one 16" with carbine tube. I don't need to do anything to any of them running carbine or rifle buffer systems with GI bolts and a variety of gas blocks, none adjustable.

Have you shot it to see if there's actually a problem or are you just going stir crazy under house arrest ?
I shot it. It needs taming down