This is a Daniel Defense AR known as the DDM4V7 chambered in 223 Remington, model 02-128-18052.
This highly maneuverable pistol features a 10.3" barrel for fast handling" accuracy" and reliability while also providing compatibility with a wide variety of muzzle devices and sound suppressors for even more customization.
Features:
Cold Hammer Forged Barrel
Low Profile Gas Block CNC Machined of 4140 Hardened Steel
MFR 9.0 M-LOK Handguard