FN USA FN 15 Military Collector Series M16A4 Complete Upper Receiver Assembly 5.56mm 20" Barrel 36320-06

Own a piece of firearm history from the makers of the world’s most battle-proven firearms. The FN 15® Military Collector Series M16 upper receiver assembly is an authentic reproduction of the original made to FN’s and the U.S. military’s exacting specifications.  A 20-inch 1:7 RH button-broached barrel is chrome-lined and chambered in 5.56x45mm NATO. The upper is furnished with a complete M16-style MIL-SPEC bolt carrier group including a HPT/MPI-tested bolt made from Carpenter 158 steel. A Knight’s Armament M5RAS quad-rail and adapter covers finish off the authentic reproduction making a perfect match for any M16-style build.

• CALIBER: 5.56x45mm
• WEIGHT: 5.61 Lbs.
• BARREL LENGTH: 20"
• OPERATION: DIRECT IMPINGEMENT RIFLE LENGTH GAS SYSTEM
• TWIST RATE: 1:7 RH
• SIGHTS: A2-style front adjustable rear sight