PRO2A 10.5" 450 Bushmaster 1/24 Carbine Length NR Side Charging Melonite M-LOK AR-15 Upper
Product Overview
Unleash big-bore stopping power with advanced ergonomics using the PRO2A 10.5" 450 Bushmaster Carbine Length Non-Reciprocating (NR) Side Charging Melonite M-LOK AR-15 Upper. This premium, factory-assembled upper receiver completely overhauls traditional manual operations by moving the charging handle to a smooth, left-side non-reciprocating layout. Built around a rugged 10.5-inch 4150 CMV Melonite-treated barrel featuring a stabilized 1/24 twist rate, this assembly delivers maximum kinetic energy in a fast-handling package. It drops seamlessly onto any standard AR-15 lower receiver configured as a pistol or registered Short Barreled Rifle (SBR).
Key Features
- Non-Reciprocating Side Charging Handle: The side-mounted charging handle stays completely stationary during firing loops. This design maximizes operator leverage, speeds up manipulation, and avoids interference with large optics or cheek risers.
- Premium Melonite / Nitride Treated Barrel: The heavy-duty 4150 CMV steel barrel features a liquid QPQ Nitride treatment inside and out for exceptional surface hardness, extreme corrosion protection, and long bore life.
- Optimized 1/24 Twist Rate: Precision button rifling stabilizes popular heavy straight-wall hunting and tactical loads ranging from 250gr to 300gr for dependable short-to-medium range accuracy.
- Modified Big-Bore Billet Receiver: CNC machined from aircraft-grade billet aluminum, engineered with a widened ejection port to clear large straight-walled 450 Bushmaster brass safely without feeding jams.
- Slim Free-Float M-LOK Handguard: A 10-inch lightweight handguard provides full-length real estate for comfortable hand placement and robust modular space for accessories like tactical lights or hand stops.
Technical Specifications
| Caliber / Chamber | 450 Bushmaster |
|---|---|
| Barrel Length | 10.5 Inches |
| Barrel Material | 4150 Chrome Moly Vanadium (CMV) Steel |
| Twist Rate | 1:24 Twist Button Rifled |
| Barrel Finish | Melonite / QPQ Nitride Finish |
| Gas System Length | Carbine-Length Gas System with 0.750" Low Profile Gas Block |
| Upper Receiver | Gibbz Arms G4 Non-Reciprocating Side Charging Billet 7075-T6 Aluminum, Widened Ejection Port, Single Large Feed Ramp, Type III Hardcoat Anodized |
| Handguard | 9" Premium Slim Free-Float M-LOK Handguard (6061-T6 Aluminum) with Full Top Picatinny Rail |
| Muzzle Thread & Device | 5/8x24 TPI; Big-Bore A2 Flash Hider |
| Bolt Carrier Group | Milspec M16 Profile BCG, Machined Bolt Face, MPI Tested, Nitride Finished, Properly Staked Gas Key |
| Manufacturing Origin | 100% Made in the USA |
Why Choose the PRO2A 10.5" 450 Bushmaster Side Charging Upper?
The 450 Bushmaster delivers massive straight-wall stopping power ideal for dense brush hunting, but manual operation can feel awkward under pressure when using a standard rear charging handle beneath a large scope. The Pro2A Tactical Non-Reciprocating Side Charging Upper solves this completely. Shifting the manual operation handle forward to the side allows you to clear malfunctions or charge the system while keeping your cheek welded to the stock and your eyes downrange. Combined with a widened big-bore billet ejection port, a factory-tested Melonite barrel, and reliable straight-walled feeding architecture, this upper provides a rugged, ergonomic, and hard-hitting build foundation.
