G&G Top Tech compatible Uppers? Apr 24, 2012 15:17:34 GMT -5 Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Collin on Apr 24, 2012 15:17:34 GMT -5 What (if any) uppers are compatible with G&G's top tech lower and gearbox, and where can I find them?Thanks