Caliber: 308 Win. Capacity: 20+1, ships with one 20-round Magpul PMag magazine. Barrel: 16.5" medium-profile, chrome-lined with A2 flash suppressor; 4150M chrome-moly-vanadium 11595E steel; 1:10" right-hand-twist rifling, and six lands and grooves. Upper/Lower Receivers: A4-type flattop upper receiver, forged 7075 T6 aircraft aluminum with aluminum triggerguard. Forend: Mid-length tapered shielded handguards. Pistol Grip: Hogue OverMolded rubber pistol grip. Sights: None, optics ready, Picatinny top rail. Weight: 7.55 lbs. Length: 34"-38". Features: Gas-impingement system, Carpenter 158 steel bolt. Compass Lake chamber specification with a matched bolt. Six-position telescoping buttstock. Comes with a hard-plastic gun case with a black web sling. Subtract 16% for the R16SFST-300 300 BLK model.