PRO2A 10.5" 450 Bushmaster 1/24 Carbine Length Melonite M-LOK AR-15 Upper
Product Overview
Unleash the ultimate big-bore firepower in a compact package with the PRO2A 10.5" 450 Bushmaster Carbine Length Melonite M-LOK AR-15 Upper. This complete, factory-assembled upper receiver assembly brings the massive kinetic force of the "Thumper" cartridge into a fast-handling configuration. Built around a rugged 10.5-inch 4150 CMV Melonite-treated barrel featuring a stabilized 1/24 twist rate, this premium upper drops seamlessly onto any standard AR-15 lower receiver configured as a pistol or a registered Short Barreled Rifle (SBR).
Key Features
- Devastating Big-Bore Firepower: Specifically built to handle the extreme pressure and operational demands of the hard-hitting 450 Bushmaster straight-wall cartridge.
- Premium Melonite / Nitride Treated Barrel: The 4150 CMV steel barrel features a uniform liquid QPQ Nitride treatment inside and out for maximum surface hardness, extreme corrosion protection, and extended bore life under heavy friction.
- Optimized 1/24 Twist Rate: Precision button rifling stabilizes common big-bore hunting and tactical loads ranging from 250gr to 300gr for dependable short-to-medium range accuracy.
- Railed Big-Bore Upper Receiver: Machined with a widened ejection port to ensure reliable feeding and clean ejection of large straight-walled brass without mechanical 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.
- Confidence Quality: Fully assembled, headspaced, and test-fired at the factory.
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 | Forged 7075-T6 Aluminum, Widened Ejection Port, Single Large Feed Ramp, Forward Assist & Dust Cover Installed, 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 |
| Manufacturing Origin | 100% Made in the USA |
Why Choose the PRO2A 10.5" 450 Bushmaster Upper?
The 450 Bushmaster is celebrated for delivering devastating straight-wall stopping power, making it a top choice for brush hunting deer, bear, and hogs. However, shooting this heavy caliber can introduce significant feeding and extraction complications if components aren't perfectly tuned. The Pro2A Tactical 10.5" Upper Receiver Group solves these challenges by combining a widened big-bore ejection port with a precisely headspaced, Melonite-finished bolt face. This balances compact, lightweight maneuverability in dense brush with reliable, factory-tested execution. If you need maximum kinetic energy from a short-barreled AR platform, this complete assembly offers a rugged, American-made solution.
