Revamped for 2015 is the Knight's Armament SR-15 E3 CQB Mod 2 SBR. This complete upper assembly is the version with an 11.5" barrel, and Knight's Armament mid-length URX 4. The URX 4 featured 2 anti-rotation QD sling swivel sockets and standard keymod attachment points. A 7 piece rail cover kit is included, along with a 5 slot picatinny rail section. The barrel is fitted with a KAC 3 prong QDC suppressor compatible flash hider and Mod 2 sealed gas block with a carbine length gas system. Atop the URX 4 is the Knight's Armament micro front sight (elevation adjustable). At the rear is the Knight's Armament 200-600m micro rear sight that is flip up and adjustable for windage and elevation. The upper receiver has the recoil slots "T" numbered and is engraved with the KAC shield. An LMT charging handle with tactical latch is included. The E3 bolt includes rounded locking lugs for extreme durability and is mated to the E3 barrel extension. The KAC CQB SBR will work with any standard SR-15 or AR-15 lower receiver once the included Knight's Armament HH buffer is installed. All NFA rules apply!