The Daniel Defense M4A1 FSP AR15 upper receiver group is tailored for customers seeking a firearm inspired by the USSOCOM SOPMOD Block II. This upper includes the M4A1 FSP RIS II picatinny quad rail in Flat Dark Earth, paired with a 14.5 inches M4 profile barrel. It features a Mil-Spec F-Marked front sight base, a Surefire SF3P flash hider / suppressor adapter and an A1.5 Fixed Rear Sight. The M16 profile full-auto bolt carrier group ensures reliability, while a rail-mounted QD Swivel Attachment Point with QD swivel provides versatile sling options.