Model: M&P 15 - Series Name: Volunteer XV PRO - Caliber: 6mm ARC - Action: Gas Operated Semi Auto - Capacity: 25+1 Rounds - Barrel Length: 16.0 Threaded (40.6 cm) - Rifling: 1:7.5 Twist 5R Rifling - Front Sight: WGS Tactical Folding Sight - Rear Sight: WGS Tactical Folding Sight - Stock: B5 Systems SOPMOD Stock - Grip: B5 Systems P-Grip 23 Pistol Grip - Length of Pull: 11.1-14.5 (28.2-36.8 cm) - Width: 2.75 (7.0 cm) - Overall Height: 8.0 (20.3 cm) - Overall Length: 33.5 (85.1 cm) Collapsed 36.75 (93.3 cm) Extended - Weight: 8.9 lbs. (4037.0 g) - Barrel Material: 4140 Steel - Barrel Finish: Armornite - Receiver Material: 7075 Aluminum - Receiver Finish: Matte Black - OTHER FEATURES - Mid-length gas system. - 15.0 aluminum S&W M-LOK forend. - B5 Systems SOPMOD stock. - PWS muzzle brake. - Williams Gun Sight Company Folding Sights - B5 Systems P-Grip 23 pistol grip. - Ambidextrous Radian Raptor-LT charging handle. - Flat-faced trigger. - Target crowned threaded barrel- 5/8-24. - 2 M-LOK rail section included. - Magpul Type-2 M-LOK rail covers included. - Forward assist. - Dust cover. - Chromed firing pin. - Forged integral trigger guard. - Armornite finish on barrel (internal and external). - Made in U.S.A.