Product Features & Specifications ArmaLite DEF10 AR-10 Defensive Sporting Rifle 308 Win/7.62 NATO 20+1 16" Chrome Moly Lined Barrel Black 6 Position Collapsible Stock Black Polymer Grip Right Hand The Armalite Defensive Sporting Rifle 10 is a semi-automatic rifle chambered in .308/7.62 NATO and comes with a 20 round Magpul PMAG. It features a 16" double-lapped and melonite treated barrel threaded for 5/8×24. It is crafted from 7075-T6 aluminum and has a flash suppressor.