The Daniel Defense M4 Carbine, V5 is perfectly adapted for end-users who plan on attaching the ever popular red dot, holographic or magnified optics to their firearm. The slick top monolithic upper receiver provides operators with valuable top rail real estate for accessories that fit their shooting needs. The DDM4v5 is equipped with a single pinned low profile gas block that is drilled, taper reamed, and press fit into place to securely attach the low profile gas block to the barrel assembly.