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Push the 5.56 NATO cartridge to its absolute limits of velocity, distance, and barrel durability. The PRO2A 22" 5.56 NATO Rifle-Length Melonite AR-15 Upper Kit is a comprehensive, range-ready package that bundles a complete precision upper receiver assembly, a premium Mil-Spec bolt carrier group (BCG), and an aluminum charging handle. Engineered around an extended 22-inch 4150 CMV steel barrel treated with a hard Melonite finish, this kit maximizes full powder combustion to harvest incredible muzzle velocities. The results are flatter trajectories, minimized wind deflection, and devastating downrange kinetic impact at extended distances. It drops natively onto any standard Mil-Spec AR-15 lower receiver. Proudly 100% designed, machined, and precision-assembled in the USA.
| Upper Receiver | Mil-Spec Forged 7075-T6 Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized Black Finish (Forward Assist & Ejection Port Cover Pre-Installed) |
|---|---|
| Bolt Carrier Group | Premium M16 Profile Mil-Spec BCG, Nitride Finish, Bolt Magnetic Particle Inspected (MPI) |
| Charging Handle | Standard Mil-Spec Aluminum Charging Handle |
| Barrel Length & Steel | 22 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Contour, Melonite Treated |
| Caliber | 5.56 NATO (Compatible with .223 Remington ammunition) |
| Twist Rate | 1:7 Twist (Optimized to stabilize heavy duty 62gr, 69gr, and 77gr match loads) |
| Gas Operating Block | Rifle-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube |
| Muzzle Device | Standard 1/2-28 Thread Pitch, A2 Birdcage Flash Hider with Crush Washer |
| Handguard | 15" Slim Profile Free-Float M-LOK Rail, Machined from 6061-T6 Aluminum |
| Lower Parts | Milspec Polished Trigger & Hammer, Standard Grip & Milspec Lower Parts |
| Stock | Standard Milspec M4 Stock with 6 position buffer tube, 3oz buffer, buffer spring, latch plate and castle nut |
| Manufacturing Origin | 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty |
Shooters seeking to extract every bit of velocity and long-distance capability from standard 5.56 cartridges select this 22-inch barrel layout to achieve tighter shot groupings and minimize wind deflection past 500 yards.
Hunters who spend long hours targeting predators across open pastures rely on the 22-inch configuration to gain maximum velocity. The flat trajectory and shortened flight time allow for clean, precise placement over wide clearings.
Enthusiasts wanting a hard-running precision setup prefer the combination of a long 22-inch barrel and a Melonite treatment. It counters the heat and high-velocity friction that quickly erodes lesser barrels, ensuring long-term throat integrity.
| SKU | P2A556GFS15RIF22-TK-KIT |
|---|---|
| Barrel Length | 22 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |
