04-17-2018, 04:27 PM
I've done multiple builds in 5.56 and Grrr with everything from 20"/RLGS to 10.3"/CLGS mated to carbine lowers and pistol lowers. 100% functional with ALL using CAR buffers and springs. A couple of the pistols have Superlative AGBs, the rest use plain 'ol non-adjustable gas blocks.

