A SECRET WEAPON FOR COLT 9MM UPPER

The top of the bolt carrier teams. The best is definitely the typical five.56mm bolt carrier team. Notice the bolt, cam pin and also the carrier critical. On The underside is the 9mm SMG bolt team.It is an ordinary FSB and no I'd no complications sighting it in. I originally built it which has a DPMS A2 upper receiver before obtaining the 604 recei