Daniel Defense M4A1 RIII 5.56mm NATO 16in Anodized Semi Automatic Modern Sporting Rifle - 30+1 Rounds - This lighter weight, fully ambidextrous version of the industry-standard DDM4 offers right- and left-handed shooters with even more flexibility and control. A 12.5in RIS III rail provides easy attachment/detachment of M-LOK accessories, and a mid-length gas system provides smooth, reliable cycling while also reducing perceived recoil and wear and tear on parts. 14.5in barrel with pinned muzzle device;