Diamondback Firearms DB15 - Semi-automatic Modern Sporting Rifle - 223 Remington/556NATO - 16" Medium Profile Threaded Barrel - Carbine Length Gas System - 4150CrMov Black Nitride - 1:8RRH Twist Rate - 1/2X28 Thread Pitch - 15" M-LOK Hardguard - Hardcoat Anodized Finish - Magpul MOE Pistol Grip and Carbine Stock - A2 Flash Hider - 30 Rounds - 1 Magpul PMAG DBK1717K005