PRO2A 7.5" 450 Bushmaster 1/24 Pistol Length Melonite M-LOK AR-15 Upper Kit

Product Overview

The PRO2A 7.5" 450 Bushmaster 1/24 Pistol Length Melonite M-LOK AR-15 Upper Kit packs massive, bone-crushing straight-walled big-bore performance into a highly compact and maneuverable pistol platform configuration. Completely chambered in .450 Bushmaster, this all-inclusive master builder package provides every necessary component to transform a standard stripped lower receiver into a functional short-barreled close-quarters powerhouse. Engineered around a premium 7.5-inch Melonite-treated heavy profile barrel, the system manages extreme muzzle pressures safely and effectively. The comprehensive master bundle ships completely assembled, timed, and headspaced on the upper receiver, packed alongside a caliber-matched heavy-duty Nitride bolt carrier group, a full internal lower components kit, and an adjustable pistol stabilizing blade buffer tube assembly to guarantee immediate project deployment.

Key Features

All-In-One Complete Pistol Bundle: Streamlines your procurement logistics by completely grouping a pre-assembled upper receiver, pre-headspaced BCG, complete internal lower hardware parts kit, and a matching buffer stabilization assembly.
Modified Big-Bore Upper Receiver: Precision machined with an custom-enlarged ejection port layout designed explicitly to facilitate flawless, high-velocity extraction clearance for massive .450 Bushmaster brass casings.
Ultra-Compact 7.5-Inch Footprint: Yields exceptional structural handling speeds and fast indexing inside vehicles, tight hunting blinds, or thick brush environments.
Precision 1/24 Twist Optimization: Explicitly land-groove engineered to rotationally stabilize heavy straight-wall large-diameter projectiles cleanly for flat, reliable close-range trajectories.
Inside-Out QPQ Melonite Protection: Premium liquid salt-bath nitride surface treatment shields internal rifling and external steel paths against severe gas erosion, rapid carbon fouling, and intense pressure scores.
Slim Free-Float M-LOK Rail: Isolates structural barrel harmonic variables to protect uniform grouping accuracy while establishing a continuous top Picatinny rail axis and modular side M-LOK accessory space.

Technical Specifications

Upper Receiver Assembly	Mil-Spec Forged 7075-T6 Aluminum, Custom-Enlarged Ejection Port for Big-Bore Brass Clearance, Single Large Feed Ramp, Type III Hardcoat Anodized Black Finish
Bolt Carrier Group (BCG)	Full M16 Profile, 9310 Steel Bolt, Slick QPQ Black Nitride Treatment, MPI Tested, Properly Staked Gas Key Layout
Charging Handle	Standard Mil-Spec Charging Handle
Barrel Length & Contour	7.5 Inches; Heavy Contour Profile
Barrel Material Composition	4150 Chrome Moly Vanadium (CMV) Steel
Twist Rate Profile	1:24 Twist Ratio (Optimized for heavy straight-wall big-bore loads)
Barrel Coating Finish	QPQ Melonite / Premium Black Nitride Exterior and Interior Lining for Maximum Corrosive Resistance
Gas Operating System	Pistol-Length Gas System with 0.750" Low Profile Gas Block, High-Tensile Stainless Steel Gas Tube Layout
Muzzle Thread & Device	5/8x24 TPI (Thread Pitch Layout); Equipped with Standard Big-Bore Flash Hider
Handguard Rails Profile	7 Inch Slim Profile Free-Float Aluminum Handguard, Integrated Top Picatinny Rail Alignment, Matrixed M-LOK Structural Slots
Lower Receiver Parts Kit (LPK)	Complete Mil-Spec Internal Hardware Small Components (Springs, Detents, Pins), Single-Stage Fire Control Trigger Group Assembly (Trigger, Hammer, Disconnector), and Standard Mil-Spec A2 Pistol Grip
Blade Assembly Setup	Polymer Pistol Stabilizing Blade Brace, Heavy-Duty AR-15 Pistol Buffer Tube, 3oz Carbine Buffer, and High-Tensile Recoil Buffer Spring Group
Manufacturing Origin & Quality	100% Proudly Assembled, Timed, and Quality Checked in the USA with Pro2A Tactical Lifetime Factory Warranty

Why Choose the PRO2A 7.5" 450 Bushmaster Pistol Kit?

Harnessing a thumping .450 straight-walled cartridge inside an ultra-short AR platform demands precision engineering that standard mass-market components cannot match. Traditional standard rifle receivers cause catastrophic stovepipe malfunctions and failure-to-extract errors because their small ejection port channels trap the wide straight-walled brass. Pro2A Tactical eliminates this engineering barrier directly on the manufacturing line—utilizing custom-expanded ejection port channels paired with a matching, pre-headspaced 9310 steel bolt face to guarantee consistent extraction strings. By running a precisely tuned pistol-length gas system alongside an advanced, slick-surface 7.5" Melonite heavy barrel, a complete internal lower components group, and a stabilizing blade brace setup, this master build kit delivers a cycle-tuned, unified shooting ecosystem. Avoid part-by-part manufacturer mismatching and assemble your hard-hitting, duty-ready asset with absolute confidence right out of the box.