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Maximize the full ballistic velocity and capability of the 5.56 NATO cartridge while fundamentally improving your platform's manual of arms. The PRO2A 20" 5.56 NATO Rifle-Length Non-Reciprocating (NR) Side Charging Upper Assembly updates traditional AR-15 operations by moving the charging handle to a heavy-duty, left-side cocking lever. The handle stays fully stationary during live-fire cycling, providing a seamless operating zone free from moving external components near your optic mount or support hand. Built around an extended 20-inch 4150 CMV barrel, this configuration maximizes complete powder burn to drive standard or heavy duty projectiles with flatter trajectories and higher kinetic impact past extended ranges. Drops natively onto any standard Mil-Spec AR-15 lower receiver to anchor a highly precise, soft-recoiling setup. Proudly 100% designed, machined, and precision-assembled in the USA.
| Upper Receiver | Gibbz Arms G4 Non Reciprocating Side Charging Billet Aluminum Receiver with Gen 2 Handle, M4 Feed Ramps, Type III Hardcoat Anodized Black |
|---|---|
| Barrel Length & Steel | 20 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Weight 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 ammunition) |
| 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 Flash Hider with Crush Washer |
| Handguard | 15" Slim Profile Free-Float M-LOK Rail, Machined from 6061-T6 Aluminum |
| Manufacturing Origin | 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty |
Shooters wanting to push small-frame limits with a hard-running Melonite assembly select this 20-inch setup. It extracts full ballistic velocity from the cartridge, ensuring high kinetic energy retention and clean, predictable placement past standard carbine ranges.
Predator and coyote hunters running bulky low-power variable optics (LPVOs), complex night vision setups, or wide thermal sights prefer side-charging platforms. The left-mounted handle leaves massive clearance space below the scope base, preventing scraped knuckles against large mounts.
Custom builders who appreciate a smooth operating cycle love the mechanical harmony of a 20-inch barrel combined with a rifle-length gas tube. The configuration decreases bolt carrier velocity for an incredibly flat-shooting, low-concussion bench experience.
| SKU | P2ANR556AX15RIF20-TK |
|---|---|
| Barrel Length | 20 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |