16" 5.56 Phosphate Carbine M-LOK M4 Upper Assembly

16" 5.56 Phosphate Carbine M-LOK M4 Upper Assembly The 16" 5.56 Phosphate Carbine M-LOK M4 Upper Assembly combines rugged design and proven functionality, perfect for shooters building a dependable, hard-use AR-15. Featuring a 16-inch M4-profile barrel with a durable mag phosphate finish and a carbine-length gas system, this upper delivers the classic feel and performance trusted by professionals. It's built on a forged mil-spec upper receiver and paired with quality American-made M-LOK handguards, offering modularity and strength where it counts. The nitrided A2 flash hider and low-profile steel gas block complete the package, while meticulous assembly practices-like using Permatex 242 and AEROSHELL 33MS-ensure long-term reliability. Whether you're equipping a range rifle or prepping a duty-grade build, this upper is ready for the challenge and backed by a limited lifetime warranty. Specifications Barrel Finish: Mag Phosphate Barrel Profile: M4 Cartridge Compatibility: 5.56 NATO Barrel Length: 16" Gas System Length: Carbine Twist Rate: 1:9 BCG / Charging Handle: Not Included Handguard: M-LOK (style may vary) Warranty: Limited Lifetime Guaranteed Sub-MOA performance with match-grade ammo and proper shooting technique Made in the USA