PRO2A 20" 224 Valkyrie 1/6.5 Rifle Length Melonite Upper Kit | Pro2A Tactical

PRO2A 20" 224 Valkyrie 1/6.5 Rifle Length Melonite M-LOK AR-15 Upper Kit

Supersonic Long-Range Precision and Soft Soft Rifle Cycling in an All-In-One Assembly Package

Stretch the capabilities of your modern sporting rifle past the 1,000-yard threshold with ultimate ballistic consistency. The PRO2A 20" 224 Valkyrie Rifle-Length Melonite AR-15 Upper Kit is a comprehensive all-in-one assembly package containing a complete precision upper receiver assembly, a premium Mil-Spec bolt carrier group (BCG), a standard aluminum charging handle, a full lower parts kit, and a 6-position adjustable stock/buffer layout. Built around an optimized 20-inch 4150 CMV steel barrel, this model utilizes an ultra-fast 1:6.5 twist rate engineered explicitly to stabilize heavy, low-drag match projectiles over massive distances. The rifle-length gas system balances internal pressures smoothly to secure exceptional structural longevity, lightning-fast follow-up shots, and flat trajectories. This bundle contains every necessary component to easily turn your stripped lower receiver into a finished long-range tack-driver. Proudly 100% designed, machined, and precision-tested in the USA.

Key Features

All-In-One Complete Rifle Build Package: Takes the technical guesswork out of building a specialized rifle. This matching master configuration ships complete with a pre-headspaced BCG, lower parts kit, polished fire control trigger assembly, and standard adjustable stock setup to complete a stripped lower out of the box.
Ultra-Fast 1:6.5 Twist Rate: Precision button-rifled with an aggressive 1:6.5 twist configuration engineered specifically to maximize rotational velocity on heavy, high-BC long-range bullets (such as 80gr, 88gr, and 90gr options) to ensure laser-like stability.
Maximized 20-Inch Bore Combustion: The 20-inch barrel allows slow-burning precision rifle powders to reach full expansion and optimal velocity metrics, ensuring rounds remain supersonic past extended distance boundaries.
Melonite/Nitride Barrel Protection: The heavy-duty 4150 CMV steel barrel is fully treated with an advanced Salt Bath Melonite finish inside and out. This premium chemical hardening vastly extends bore life against rapid gas port erosion and shields against moisture.
Ultra-Smooth Rifle-Length Gas Dwell: Pairing a precision 20-inch barrel with a true rifle-length gas tube drops internal carrier pressure, establishing an exceptionally soft recoil impulse that limits benchrest scope disruption.
Slim Profile Free-Float M-LOK Rail: Crafted from premium 6061-T6 aluminum, the free-float rail isolates barrel vibrations to preserve uniform mechanical accuracy while providing massive M-LOK modular real estate.

Technical Specifications

Upper Receiver	Mil-Spec Forged 7075-T6 Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized Black Finish (Forward Assist & Ejection Port Cover Pre-Installed)
Bolt Carrier Group	Premium M16 Profile Mil-Spec BCG, Nitride/Melonite Finish, Correctly Headspaced, Properly Staked Gas Key, MPI Tested
Charging Handle	Standard Mil-Spec Aluminum Charging Handle
Barrel Length & Steel	20 Inch Profile, 4150 Chrome Moly Vanadium Steel, Heavy/Medium Contour, Melonite Treated
Caliber	.224 Valkyrie
Twist Rate	1:6.5 Twist (Optimized to stabilize heavy 80gr to 90gr low-drag match bullets)
Gas Operating Block	Rifle-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube
Muzzle Interface	Standard 1/2-28 Thread Pitch, A2 Birdcage Flash Hider with Crush Washer
Handguard	15 Inch Slim Profile Free-Float M-LOK Rail, Competition Top Picatinny Rail, Machined from 6061-T6 Aluminum
Lower Parts	Mil-Spec Polished Trigger & Hammer, Standard Pistol Grip, Lower Component Springs, and Pins Included
Stock	Standard Mil-Spec M4 Stock with 6-position buffer tube, standard 3oz buffer, buffer spring, latch plate, and castle nut
Manufacturing Origin	100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Why Choose This Product?

The PRO2A 20" 224 Valkyrie Rifle Length Upper Kit directly solves the largest challenge encountered when stepping into custom long-range calibers: matching specific component dimensions and stabilizing heavy match ammunition. While traditional 1:7 twist rates can struggle with heavy match bullets, Pro2A Tactical's specialized 1:6.5 fast-twist rifling forces instantaneous projectile stabilization right out of the chamber, ensuring high ballistic coefficients are maintained accurately downrange.

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