SKU: RJ3631807
MPN: 36318-07
The FN USA FN 15 Military Collector Series M4 Complete Upper Receiver Assembly in 5.56mm is an authentic reproduction of military-grade rifles that have proven their reliability in combat. This complete upper assembly is ideal for builders and collectors who seek genuine military components rather than commercial alternatives. It serves as a solid foundation for duty rifles, patrol carbines, and precision training builds where performance is paramount.
Featuring a 16-inch chrome-lined barrel with button-broached rifling and a 1:7 twist rate, this upper assembly is optimized for standard 5.56x45mm NATO ammunition across various bullet weights. The welded compensator effectively manages recoil while ensuring compliance with federal regulations regarding barrel length. Constructed with Carpenter 158 steel for the bolt and a chrome-lined barrel treatment, it resists corrosion and enhances durability in demanding conditions.
This upper receiver assembly is perfect for law enforcement armories, military unit collectors, and serious civilian shooters who prioritize authenticity and reliability. It can be paired with lower receivers to create a complete firearm tailored to specific needs. With its military pedigree, this assembly is designed to meet the rigorous demands of both professional and recreational use.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
