SYTY

Thanks for the help I'm going to tell my cousin to stay with Armalite set up only.

No he hasn't bought an upper yet he asked me if i know if it will fit, So the Repr upper won't fit on the Armarlite lower?, piston & DI gas system should not make a difference just change buffer and spring for piston system like on the AR15s no.

HI this is my first post, My cousin sent me a email today asking if a (LWRC REPR MKII UPPER RECEIVER COMPATIBLE WITH A ARMALITE AR-10 LOWER)? It looks like it might work but i didn't want to tell him it would. I talked to Stag & they said the Stag 10 uppers will work on a AR-10 A lower. Any info would be great