The only piston AR-type rifle I can recommend is an HK. Cost and availability keeps that out of most people's arsenals. As stated above, the carbon goes somewhere.....on a piston it goes, well, on the piston and usually all around it. The HK (at least the vented gas blocked ones) expels the excess gas forward and upward, away from the weapon. All other piston systems that I'm aware of vents it out under the handguards somewhere, usually making a mess of everything around it.
If you want a piston gun you should look for one built from the ground up as a piston weapon, not one added as an afterthought.
11C2P '83-'87
Airborne Infantry
F**k China!
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