The Windham Weaponry SRC is a semi-automatic gas impingement system rifle. It features hardcoat black anodized finish forged 7075-T6 aircraft aluminum lower and M4A4 type flat top upper receivers 4150 chrome moly vanadium steel M4 profile 16 chrome-lined barrel with M4 feed ramps and A2 flash suppressor and a six-position telescoping buttstock. The SRC also offers an A2 black plastic pistol grip M4 double heat shield handguards Picatinny rail gas block aluminum trigger guard and manual lever safety. DETAILS Action Semi Auto - Caliber .223 Rem 5.56mm NATO - Capacity 301 - Finish Hardcoat Black Anodize - Bolt Material Carpenter 158 Steel - Receiver M4A4 Type Flat Top Upper wHandle - Receiver Material 7075 T6 Aircraft Aluminum - Stock 6 Position Telescoping Buttstock - Grip A2 Black Plastic - Sights Adjustable - Safety Manual Lever with Indicator Markings - Twist 19 - Barrel 16 M4 Profile Chrome Lined wA2 Flash Supressor - Overall Length 36.125 - Weight 6.3 lb