MI-ARP300CRM9/ARP556CRM9
.300 AAC Blackout or 5.56 NATO cal., GIO, pistol (.300 AAC Blackout) or carbine (5.56 NATO) length gas system, 10 1/2 in. barrel, A2 flash hider, low profile gas block, 10 shot mag., uses AR-15 mags., forged aluminum receivers, SBA3 brace,...