PRO2A 16" 450 Bushmaster 1/24 Carbine Length NR Side Charging Melonite M-LOK AR-15 Upper
Thumping Straight-Wall Power with Premium Ergonomics and Optic Clearance
Bring the heavy-hitting, straight-wall authority of the .450 Bushmaster cartridge to a modern, ergonomic layout with the PRO2A 16" Non-Reciprocating (NR) Side Charging AR-15 Upper Receiver Assembly. Precision-engineered to dominate deer woods, big-game hunting, and tactical applications alike, this premium complete upper group drops directly onto any standard Mil-Spec AR-15 lower receiver. Shifting the manual action to a stationary, left-side charging handle clears room beneath large hunting scopes and high-magnification optics. Built around a premium 1/24 twist Melonite-treated barrel with an enlarged big-bore ejection port, this setup delivers clean cycling and massive downrange kinetic energy.
Key Features:
- Non-Reciprocating Side Charging Action: The left-side manual handle remains completely stationary while the weapon fires, shielding your hand and ensuring you can cycle the bolt without breaking your sight picture.
- Enlarged Ejection Port Cutout: Specially widened receiver port layout ensures effortless clearance of large straight-wall .450 Bushmaster brass, stopping stovepipe failures before they happen.
- Advanced Melonite Barrel Treatment: The premium 4150 CMV steel barrel is fully treated with an advanced Salt Bath Melonite finish inside the bore and across the exterior to extend service life and maximize corrosion resistance against harsh weather.
- Optimal 1/24 Twist Configuration: Precision button-rifled twist profile specifically engineered to stabilize standard 250gr to 300gr big-bore projectiles with pinpoint accuracy.
- Slim Profile Free-Float M-LOK Rail: Machined from high-strength aluminum, the lightweight handguard completely isolates barrel vibrations to preserve uniform mechanical accuracy while providing a continuous top rail and modular M-LOK slots.
- USA Armor Assembled: Hand-built, headspaced, and rigorously quality checked in America by expert armorers to guarantee out-of-the-box reliability.
Technical Product Specifications:
| Upper Receiver Assembly | Gibbz Arms G4 Premium Non-Reciprocating Side Charging Billet Upper Receiver, Custom Enlarged Ejection Port, Type III Hardcoat Anodized Black Finish |
|---|---|
| Charging Handle | Left-Side Non-Reciprocating Charging Handle Assembly (Stationary During Firing Cycle) |
| Barrel Component | 16 Inch Profile, 4150 Chrome Moly Vanadium (CMV) Steel, Heavy Contour, Melonite Treated Interior & Exterior Bore |
| Caliber | .450 Bushmaster (Straight-Wall Compliant) |
| Twist Rate | 1:24 Twist |
| Gas Operating Block & System | Carbine-Length Gas System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube |
| Muzzle Device Component | Standard 5/8x24 Thread Pitch, Big-Bore Muzzle Device with Crush Washer Pre-Installed |
| Handguard Rail | 12 Inch Slim Profile Free-Float Aluminum Handguard, Continuous Top Picatinny Alignment, Modular M-LOK Attachment Points |
| Manufacturing Origin | 100% Assembled and Quality Checked in the USA with Pro2A Tactical Lifetime Factory Warranty |
Why Choose the PRO2A .450 Bushmaster Side Charging Upper?
Standard rear-charging AR conversions create real mechanical frustration when paired with large hunting optics. Trying to clear an extraction issue or rack a heavy round beneath a low-mounted rifle scope can be clumsy and slow. The PRO2A 16" .450 Bushmaster Non-Reciprocating Side Charging Upper directly answers this problem with its intuitive, left-side cocking action. By combining this fluid manual control with a 1/24 twist Melonite barrel and hand-fitted headspace geometry, you secure maximum stopping power and target tracking accuracy without splitting the system's reliability. Hand-built and test-fired in the USA, this premium upper upgrade yields target-dropping authority while redefining your heavy caliber shooting experience.
