FM Products FM-9 AR 9mm Rear Charging Upper Receiver 16 inch Black FM9-RS-1615. These AR15 Upper Receivers made by FM Products are constructed from a proprietary blend of match-grade 41V50 chrome moly vanadium steel that's tough enough to last and...
FM Products FM-9 AR 9mm Rear Charging Upper Receiver 16 inch Black FM9-RS-1615. These AR15 Upper Receivers made by FM Products are constructed from a proprietary blend of match-grade 41V50 chrome moly vanadium steel that's tough enough to last and...