Model: M&P15 - Series Name: Volunteer XV - Caliber: 5.56mm NATO/223 REM - Action: Gas Operated Semi Auto - Capacity: 10+1 Rounds - Barrel Length: 16.0 (40.6 cm) - Rifling: 1:8 Twist 5R Rifling - Front Sight: Adjustable A2 Post - Rear Sight: Magpul MBUS - Stock: B5 Systems Bravo Fixed Stock - Grip: B5 Systems P-Grip 23 Pistol Grip - Length of Pull: 14.25 (39.2 cm) - Width: 2.5 (6.4 cm) - Overall Height: 9.0 (22.9 cm) - Overall Length: 36.25 (92.1 cm) - Weight: 8.8 lbs. (3991.7 g) - Barrel Material: 4140 CMV Steel - Barrel Finish: Armornite - Receiver Material: 7075 Aluminum - Receiver Finish: Matte Black - OTHER FEATURES - BCMGunfighter forend with M-LOK - Flat-faced trigger. - B5 Systems Bravo Stock. - B5 Systems P-Grip 23 pistol grip. - Chromed firing pin. - Forward assist. - Dust cover. - Forged integral trigger guard. - Armornite finish on barrel (internal and external)