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Old December 25, 2010, 06:03 AM   #19
Senior Member
Join Date: October 13, 2010
Posts: 598
The piston gun will send less carbon back to the bolt carrier and bolt, that's about it. Unless its an HK416 which is really a different gun in an AR's body (and probably not something you even considered buying), a piston AR will be less reliable for a lot of reasons (carrier tilt etc).
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