The Alexander Arms® 300 AAC Blackout rifle has a Picatinny flat-top railed receiver with carbine-length gas system, free-floated G10 fiberglass composite handguard, Picatinny railed gas block, AAC Blackout 51T flash hider, M4 stock, semi-automatic military-style trigger, and a 16-inch, tightly-dimensioned, 416 stainless steel, 1:8 twist, fluted barrel. Muzzle threading is 5/8-24 TPI. Upper receiver features extended feed ramps. Receiver extensions and carrier gas keys are properly staked. This weapon will fire both supersonic and subsonic ammunition. This product ships in an Alexander Arms® soft carry bag with one 30-round CAA polymer magazine. As pictured, this rifle features optional upgrades and non-standard components.