16" M4 Carbine 1:8 M-LOK Upper Assembly - Black - 21089

16″ M4 Carbine 1:8 M-LOK Upper Assembly – Black

Classic M4 styling with modern modularity.

The 16″ M4 Carbine 1:8 M-LOK Upper Assembly – Black is a well-rounded, duty-grade solution built for shooters who value reliability, consistency, and attention to detail. Assembled on a mil-spec forged upper receiver, this build features a 16″ M4-profile barrel finished in durable nitride/melonite, offering excellent wear resistance and long service life.

A 1:8 twist rate provides excellent versatility across a wide range of bullet weights, while the carbine-length gas system and nitrided low-profile steel gas block ensure smooth and dependable cycling. American-made M-LOK handguards (style may vary) provide lightweight modularity, and the upper is finished with one of the cleanest nitrided A2 flash hiders you’ll find anywhere.

Every component is secured using Permatex 242 and properly torqued with AEROSHELL 33MS anti-seize grease, ensuring a build that holds zero and runs reliably under stress. BCG and charging handle are not included, allowing you to customize your internals. Backed by a Limited Lifetime Warranty and Sub-MOA Guarantee with match-grade ammo and proper shooting technique.

Specifications

• Barrel Finish: Nitride / Melonite
• Barrel Profile: M4
• Gas System Length: Carbine
• Barrel Length: 16″
• Cartridge Compatibility: 5.56 NATO
• Twist Rate: 1:8
• BCG / Charging Handle: Not Included
• Handguard: American-Made M-LOK (style may vary)
• Muzzle Device: Nitrided A2 Flash Hider
• Warranty: Limited Lifetime
• Guarantee: Sub-MOA performance with match-grade ammo
• Origin: Made in the USA

A dependable choice for training, range time, or general-purpose defense builds—this upper delivers classic function with modern refinement.