Unleash definitive big-bore energy in an ultra-compact package with the PRO2A 7.5" 450 Bushmaster Upper Receiver Group. Completely assembled, headspaced, this short-barreled upper is a specialized solution built for dense brush hunting, defense applications, and maximizing short-range thumping power. Featuring an engineered 1/24 twist rate and premium Melonite finish, it is explicitly constructed to handle heavy, high-impact projectiles with unflinching consistency.
Key Features
- Ultra-Compact Profile: The 7.5-inch barrel configuration yields incredible maneuverability in dense brush, blind setups, or tight vehicle corridors.
- Melonite (QPQ) Hardened Coating: Delivers an exceptionally slick, diamond-hard surface both inside the bore and across the exterior to safely shield against friction, rust, and premature wear.
- Rigid M-LOK Handguard: Grants clean, low-profile placement for accessory setups like tactical illuminators, hand stops, or optics without altering barrel harmonics.
- Hand-Built Quality Standards: Meticulously checked for precise upper receiver uniformity, gas port diameter consistency, and headspace tolerance to maximize functional longevity.
Technical Product Specifications
- Caliber / Chamber: .450 Bushmaster
- Barrel Length: 7.5 Inches
- Gas System Length: Pistol-Length (calibrated for reliable cycling with high-pressure big-bore loads)
- Barrel Twist Rate: 1/24 Twist (optimized for standard heavy-grain 450 projectiles)
- Barrel Material & Finish: 4150 Chrome Moly Vanadium with a premium Melonite / Black Nitride QPQ treatment
- Upper Receiver Style: Standard Mil-Spec Forged 7075-T6 Aluminum, Enlarged Ejection Port, Forward Assist & Port Cover with Single Large Feed Ramp, Anodized Black
- Handguard Type: 7 Inch Slim Free-Float M-LOK Handguard with an integrated top Picatinny rail structure
- Gas Block Journal: 0.750" Low-Profile Gas Block
- Muzzle Device: 5/8x24 TPI Big Bore A2 Flash Hider
- Platform Compatibility: Standard AR-15 mil-spec lower assemblies
- Manufacturing: 100% Made in the USA from raw, domestic components
Why Choose the Pro2A Tactical 7.5" 450 Bushmaster Upper?
Devastating Compact Stopping Power
The .450 Bushmaster is celebrated for its straight-walled hunting performance and structural impact capacity. Packing this large-caliber projectile profile into a lightweight 7.5-inch setup produces a highly portable powerhouse that handles like an agile pistol or SBR while retaining immediate close-range dominance.
Rigorous Professional Assembly
Big-bore AR platforms demand exact gas dynamics and component fitment to cycle safely and reliably. Pro2A Tactical spends the additional production time lapping receivers, verifying gas block alignment, and assuring a seamless barrel-extension-to-receiver connection so your upper cycles reliably from the very first pull.
True American Craftsmanship and Lifetime Warranty
Every piece is proudly built right in Cumming, Georgia using premium components sourced from leading USA manufacturers. Pro2A Tactical stands firmly behind its products with a comprehensive lifetime warranty against manufacturer defects in materials or workmanship, keeping your investment protected for the long haul.
*Click here to view our complete warranty and build guidelines.
