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Own a piece of firearm history from the makers of the world’s most battle-proven firearms. The FN 15® Military Collector Series M4 upper receiver assembly is an authentic reproduction of the original, made to FN’s and the U.S. military’s exacting specifications. A 14.7-in. chrome-lined barrel is button-broached, with a 1:7 twist rate, the welded compensator brings the barrel length to 16-in. Cut with a 5.56x45mm NATO chamber to mate with the Carpenter 158 steel bolt, each MIL-SPEC bolt carrier is high-pressure and magnetic particle tested for enduring reliability.
