Who's installed piston kits? What's been your experience?

samsplacci71

samsplacci71

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I am sure this subject creeps up every now and then, so I am sure eye rolling is justified. However, I'm a relative newb to the AR world and find that my DI gun bolt past the rings gets a lot of carbon on my AR in 7.62x39.

I am running typical non-corrosive plinking LCW/Dominion and Barnaul ammo. I am not seeing the same amount hard carbon fouling on the back of the bolt on my 5.56 AR with similar number of rounds. I know I am using better quality ammo for 5.56.

The piston kit retro fit would resolve the issue of carbon deposition on the bolt but will it only cause the same problem on the short stroke piston?

Thoughts????

thanks gunners
 
We tried to get an Adams Arms kit to run on a buddies 76239 AR. Couldn't get it to reliable cycle. It was a 14.5" barrel on a Carb gas system. Seemed under gassed, but that's only a guess.

Swapped out the barrel and bolt for 223 and no problems.

I am guessing the kit is set up for the pressure curve of 223, and getting one to work reliably on 762x39 might take a little work.

YMMV

GC
 
I personally wouldn't even consider taking a reliable DI gun and retrofitting a piston system which, almost guaranteed, is going to result in a gun that is to some degree less reliable. If you want a piston gun, I'd suggest getting a complete factory piston upper. There are some really good ones out there. HK for example.

Sort of the difference between buying the version of your dream car with the turbo... OR buying the naturally aspirated version and bolting a random turbo on in your garage. May work... but probably not as well as the factory designed combination.
 
CobraGT said:
I personally wouldn't even consider taking a reliable DI gun and retrofitting a piston system which, almost guaranteed, is going to result in a gun that is to some degree less reliable. If you want a piston gun, I'd suggest getting a complete factory piston upper. There are some really good ones out there. HK for example.

Sort of the difference between buying the version of your dream car with the turbo... OR buying the naturally aspirated version and bolting a random turbo on in your garage. May work... but probably not as well as the factory designed combination.
Click to expand...
+1.very well explained.
BTW, Osprey/Bushmaster retrofit piston kit available in our market???
 
Last edited:
CobraGT said:
I personally wouldn't even consider taking a reliable DI gun and retrofitting a piston system which, almost guaranteed, is going to result in a gun that is to some degree less reliable. If you want a piston gun, I'd suggest getting a complete factory piston upper. There are some really good ones out there. HK for example.

Sort of the difference between buying the version of your dream car with the turbo... OR buying the naturally aspirated version and bolting a random turbo on in your garage. May work... but probably not as well as the factory designed combination.
Click to expand...

Roger that.
 
Gas Can said:
We tried to get an Adams Arms kit to run on a buddies 76239 AR. Couldn't get it to reliable cycle. It was a 14.5" barrel on a Carb gas system. Seemed under gassed, but that's only a guess.

Swapped out the barrel and bolt for 223 and no problems.

I am guessing the kit is set up for the pressure curve of 223, and getting one to work reliably on 762x39 might take a little work.

YMMV

GC
Click to expand...

Was the AR a NEA upper, that's what mine is. The pressure difference from the 5.56 vs the 7.62x39 makes sense, hence the difficulties with cycling.
 
Either buy a piston gun like a POF or get a coated BCG.
Conversion kits are trouble from I had read.
My POF P308 has an NP3 coated bolt and it just wipes clean with no solvent.
There are a few places in Canada that offer similar coatings.
 
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