When you’re looking for Maxim Defense ingenuity in a standard AR-15 package the MD:15L is your answer. The MD:15L was engineered to fit the growing demand for reliable accurate and affordable AR15-style rifles for today’s Law Enforcement Patrol Officers. – For increased comfort and versatility every MD-15 features our free-floating Slimline handguard. These handguards provide a monolithic-like upper receiver platform and M-Slot compatibility. – Caliber : 5.56 NATO – Barrel Length: 16 inches – Thread Pitch: 1/2×28 – Weight: 6lbs 6oz – Overall Length: 33 inches – Material Composition: 7075 and 6061 aluminum – Finish: Nitride / Type III anodizing – Stock/Brace Options: Magpul MOE SL-K