Models View all AR-15 Low Profile Gas Block 36 1006 3 AR-15 Pistol Length Barrel .223/5.56 36 892 3 9MM Luger Cartridge 13 360 0 .308 Win./7.62 NATO Cartridge 21 632 2 .300 Blackout Cartridge 13 221 0 50 BMG Cartridge 11 386 0 Education Student at Oregon State University