Here is a Daniel Defense DDM4 V9 5.56 NATO 16". The long, 15" DDM4 quad rail over a 16" cold hammer-forged barrel with a Government profile gives the operator the option to have the support hand extended out close to the muzzle allowing them to drive the gun more precisely, and preventing over travel when transitioning between multiple targets. This combined with a mid-length gas system which is known to have a smoother recoil impulse allows for quick but precise rapid fire. The longer rail also affords the shooter plenty of real estate for optics and accessories. It also has a rugged and comfortable Daniel Defense Buttstock and Pistol Grip.