The Daniel Defense M4, V5 Lightweight Upper Receiver Group is built with a Cold Hammer Forged 16” Lightweight profile barrel making it approximately five ounces lighter than the original V5. It carries the DDM4 Rail™ 12.0, perfectly adapted for end-users who need valuable rail real estate for accessories that fit their shooting needs. QD Swivels attachment points are integrated into the front and back on both sides of the rail for fully ambidextrous sling attachment. The DDM4v5 LW URG is equipped with a single pinned low profile gas block at mid-length that is drilled, taper reamed, and press fit into place to securely attach to the barrel assembly. Daniel Defense complete upper receiver groups come complete with bolt carrier group and charging handle.