Model: M&P15 - Series Name: Volunteer XV DMR - Caliber: 5.56mm NATO/223 REM - Action: Gas Operated Semi Auto - Capacity: 30+1 Rounds - Barrel Length: 20.0 (50.8 cm) - Rifling: 1:8 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: 37.4 (95.0 cm) Collapsed 40.7 (103.4 cm) Extended - Weight: 8.13 lbs. (3688.3 g) - Barrel Material: 4140 CMV Steel - Barrel Finish: Armornite - Receiver Material: 7075 Aluminum - Receiver Finish: Matte Black - OTHER FEATURES - Rifle-length gas system. - 15.0 aluminum S&W M-LOK forend. - B5 Systems SOPMOD stock. - PWS 556 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. - 2 M-LOK rail section included. - Chromed firing pin. - Forward assist. - Dust cover. - Forged integral trigger guard. - Armornite finish on barrel (internal and external).