This model makes use of the Juggernaut Tactical® magazine lock system with quick release rear takedown pin/opening pin. Built to perform under various conditions the M&P SPORT III rifle is as versatile as it is reliable. Engineered for a wide variety of recreation sport shooting and professional applications. The new SPORT III offers more options to accessorize than the previous generations. Lightweight and rugged the SPORT III embodies the best combination of function and form. Get unmatched value with the new M&P SPORT III. – Model M&P®15 SPORT III CA Compliant – Caliber 5.56 NATO/223 REM – Rifle Weight 6.5 lbs. (2948.4 g) – Handguard Free-floating 15 M-LOK® – Grip Polymer – Top Rail Picatinny-style full-length – Width 2.5 (6.4 cm) – Barrel 16 (40.6 cm) w/A2 Compensator – Overall Height 8 (20.3 cm) – Receiver(s) 7075-T6 Aluminum – Barrel Material 4140 Steel w/Armornite® finish – Overall Length 35 (89 cm) Extended 32 (81 cm) Collapsed – Action Gas operated Semi-auto – Other Bolt forward assist & dust cover – Stock 6-position Adjustable – Charging Handle Std. M&P15 – Rifling 1:8 Twist 5R rifling