Gas piston system

I have only ever seen Adams Arms and CMMG aftermarket piston kits in action. CMMG sh*t the bed big time, while the Adams Arms ran flawlessly for the couple thousand rounds I saw it run through.

Just my half buck.
(I don't short change my opinions. :p )
 
I think that a lot of the problems people have with that kind of aftermarket parts is that they are not meticulous enough when putting everything together. Slight misalignments will give problems after a few thousand rounds.
 
my impression was that the adoption of the HK by some organizations was related to an interest in running a weapon that is more reliable when short and suppressed.
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I run suppressed DI guns as short as 6.5" and they work just fine. The can actually improves reliability because it increases the backpressure. The downside to that being the shot of gas in the face (especially considering I am a lefty). I have gotten around that by using a 3Bucc brass catcher.

A piston sysem would reduce the gas blowback for sure but it doesn't eliminate it because gas still comes out the chamber after ejection.

I have a DI test rifle that I abuse horribly and rarely clean. It is shot only with suppressors and usually consumes large amounts of ammo in a very short period of time during various tests. It gets dirty and excessively overheated and still continues to function. To me, the piston systems are a solution to a non-existent problem.
 
You know, the more that I think about it, the more I think I am conflating two concepts.

Short-barreled guns are really advantageous for use with suppressors.

Purpose-built piston guns like the 416 seem to be less sensitive to barrel length than DI guns, although I agree that a properly built DI shorty should run fine.

But that does not mean that the advantages of a piston gun are directly related to suppressor use, as I originally implied. They are indirectly related through the tertiary variable of barrel length.
 
Suputin said:
I run suppressed DI guns as short as 6.5" and they work just fine. The can actually improves reliability because it increases the backpressure. The downside to that being the shot of gas in the face (especially considering I am a lefty). I have gotten around that by using a 3Bucc brass catcher.

A piston sysem would reduce the gas blowback for sure but it doesn't eliminate it because gas still comes out the chamber after ejection.

I have a DI test rifle that I abuse horribly and rarely clean. It is shot only with suppressors and usually consumes large amounts of ammo in a very short period of time during various tests. It gets dirty and excessively overheated and still continues to function. To me, the piston systems are a solution to a non-existent problem.
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Well said.

Noveske makes a part called the "switchblock". It's suppose to mitigate gas blowback in DI AR's. I'm looking at picking up a Noveske 14.5" light carbine with the switchblock, as well as an AAC m4-2000 suppressor. Be interesting to see how it works.
 
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