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Amsdorf · July 13, 2012, 06:21 AM

There is no piston in a DI AR15.

There is a gas tube and bolt key...perhaps you are referring to those?

July 13, 2012, 06:21 AM	#4
Amsdorf Junior member Join Date: July 24, 2011 Location: Saint Louis, Missouri Posts: 849	There is no piston in a DI AR15. There is a gas tube and bolt key...perhaps you are referring to those?