Semi-automatic Adaptive Combat Rifle chambered in 5.56 NATO, 6.8 SPC, .300 Blackout, .450 Bushmaster. Barrel is quickly interchangeable and available in 10.5, 14.5, 16.5 and 18.5 in. AAC Blackout 51T flash hider, 3-rail enhanced hand guard, with 7-position folding/telescoping stock. A-TACs model has fixed A-frame composite camo stock, with rubber butt pad and sling mounts. Introduced in 2013. Prices shown are for 5.56/16.5 in. 90704. (Model no. 90705. 5.56/16.5 in. Coyote Brown. Gas piston.)