The Windham Weaponry R16SFST is a semi-automatic gas impingement system rifle. It features hardcoat black anodized finish forged 7075-T6 aircraft aluminum lower and flat top upper receivers as well as a 4150m chrome moly vanadium steel medium profile 16.5 chrome-lined barrel with A2 flash suppressor. It also offers a Carpenter 158 steel bolt KeyMod 15 handguard six-position telescoping buttstock Hogue overmolded pistol grip and manual lever safety. Details Action Semi Auto - Caliber .308 Win - Capacity 201 - Finish Hardcoat Black Anodize -Bolt Material Carpenter 158 Steel - Receiver Flat Top Upper - Receiver Material 7075 T6 Aircraft Aluminum - Stock Hogue 6 Position Telescoping Buttstock - Forend Midwest Key Mod 15 Handguard - Grip Hogue Overmolded - Safety Manual Lever with Indicator Markings - Twist 110 - Barrel 16.5 Medium Chrome Lined wA2 Flash Suppressor - Overall Length 38 - Weight 7.65 lb