This is a Daniel Defense AR known as the V9 chambered in 223 Remington, model 02-145-15175-047.
The new Daniel Defense DDM4V9 is designed to satisfy the needs of modern shooters not only in popular shooting sports but also for tactical and defensive applications. The long" 15" DDM4 quad rail over a 16" cold hammer forged Government profile barrel 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.
Features:
Mil-Spec
Enhanced Flared Magazine Well
Cold Hammer Forged Barrel
Daniel Defense Flash Suppressor
M16 Profile BCG