The Hunter model is chambered in .308 Win/ 7.62 x 51 NATO comes with a 18” Chrome Moly Vanadium Steel barrel with a 1-10 twist, Forged Receivers, Anderson?s proprietary 17-4 stainless steel match grade Trigger and Hammer, Anderson 308 Knight Stalker Flash Hider, Anderson?s EXT Free Float, Molding Solutions TI17 Butt stock and Hogue pistol grip, Ambi sling mount, comes with one twenty round magazine. All receivers, charging handles and buffer tubes are 7075 T6. NON RF85