RaymondMillbrae Posted December 16, 2009 Share Posted December 16, 2009 (edited) Hey folks, I have a buddy who is contempleting installing a GPU (Gas Piston Upper) drop-in to his AR rifle. I am not sure if it is a full length AR rifle, or if it is a carbine or mid length rifle. I guess I just wanted to pick your brains for good manufacturers, and we can go from there. Thanks. In Christ: Raymond Edited December 16, 2009 by RaymondMillbrae Link to comment Share on other sites More sharing options...
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