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The PRO2A 10.5" 12.7x42 Carbine Length Melonite NR Side Charging M-LOK AR-15 Upper Kit represents the absolute apex of modern ergonomic engineering fused with unstoppable big-bore firepower. Fully chambered in 12.7x42mm (fully compatible with .50 Beowulf loads), this advanced master builder bundle swaps out the traditional mil-spec rear latch layout for a high-performance Non-Reciprocating (NR) Left-Side Charging Upper Receiver system. Designed around an optics-ready layout and a premium 10.5-inch Melonite-treated heavy profile barrel, this package handles brutal straight-walled big-bore operating pressures with absolute control. The comprehensive master bundle ships completely assembled and headspaced on the upper, combined with a dedicated side-charging Nitride bolt carrier group, a full lower small parts group, and an adjustable pistol stabilizing blade receiver extension assembly to complete your stripped lower receiver right out of the box.
| Charging System Orientation | Left-Side Non-Reciprocating (NR) Side-Charging Upper Assembly; Forward Handle Remains Stationary While Firing |
|---|---|
| Upper Receiver | Gibbz Arms G4 Billet Aluminum, Custom-Enlarged Ejection Port, Single Large Feed Ramp, Type III Hardcoat Anodized Matte Black Finish |
| Bolt Carrier Group (BCG) | Full Auto M16 Profile, Machined 9310 Steel Bolt, Caliber-Matched 12.7x42mm Face Assembly, Slick QPQ Black Nitride Treatment, MPIInspected, Properly Configured Gas Key Layout |
| Barrel Length & Contour | 10.5 Inches; Heavy Contour Profile |
| Barrel Material | 4150 Chrome Moly Vanadium (CMV) Steel |
| Twist Rate Profile | 1:20 Twist |
| Barrel Coating Finish | QPQ Melonite / Premium Black Nitride Exterior and Interior Lining for Corrosive Resistance |
| Gas Operating System | Carbine-Length Gas System, Stainless Steel Gas Tube Layout |
| Muzzle Thread & Device | 49/64-20 TPI (Thread Pitch); Equipped with Competition Muzzle Brake |
| Handguard Rails Profile | 9 Inch Slim Profile Free-Float Aluminum Handguard, Continuous Top Picatinny Rail Alignment, Modular M-LOK Attachment Slots |
| Lower Receiver Parts | Complete Mil-Spec Component Springs and Pins Hardware, Single-Stage Fire Control Trigger Group (Trigger, Hammer, Disconnector), and Standard A2 Pistol Grip |
| Brace Assembly setup | Adjustable Blade, Pistol Buffer Tube (Extension), 3oz Carbine Buffer, and High-Tensile Recoil Buffer Spring Assembly |
| Manufacturing Origin | 100% Proudly Assembled and Quality Checked in the USA with Pro2A Tactical Lifetime Factory Warranty |
Harnessing a thumping .50 caliber straight-walled cartridge inside an AR-15 platform demands precision engineering from the bolt lugs to the receiver frame. Standard mil-spec rear charging handles force the shooter to disrupt their sight picture and battle heavy recoil springs blindly underneath an optic mount. The Pro2A Non-Reciprocating Side-Charging system rewrites this manual of arms entirely. By moving the cycle layout to a left-side ergonomic handle, you can clear clear chamber actions or load heavy rounds intuitively while keeping your eyes completely downrange. Furthermore, standard upper receivers trigger persistent stovepipe jams because their narrow ejection channels trap expanding 12.7x42mm casings. Pro2A master kits eradicate this failure pathway on the manufacturing line—utilizing billet-enlarged ejection port tracks paired with a custom-headspaced 9310 steel bolt face. By aligning an ultra-hard 10.5" Melonite heavy barrel to an integrated lower component setup and matching pistol blade brace, this package delivers a cycle-tuned, unified shooting ecosystem designed for absolute tactical reliability.
| SKU | P2ANR127AX9CAR105-HT-KIT |
|---|---|
| Barrel Length | 10.5 inch |
| Rifle Caliber | 50 Beowulf |
| Manufacturer | Pro2A Tactical |
