PRO2A 16" 22LR 1/16 Rimfire Melonite M-LOK Upper

PRO2A 16" 22LR 1/16 Rimfire Melonite M-LOK AR-15 Upper

Product Description

Maximize your training efficiency, target precision, and cost-effective firearm manipulation on standard small-frame systems. The PRO2A 18" 16" 22LR Rimfire Upper Assembly is meticulously engineered to unlock full-length .22 Long Rifle performance within a familiar, standardized control envelope. Unlike standard centerfire setups running dirty adapter drops, this platform uses an exact-spec rimfire chamber and barrel grouping to secure superior projectile stabilization and clean cyclical routing. Built around a premium slick-side upper receiver, this system handles mass bulk ammunition options smoothly via a direct blowback bolt system. The 1:16 twist profiling stabilizes standard lead or copper-plated rimfire projectiles over longer arcs, while an extended 15-inch free-floating M-LOK aluminum handguard supplies massive real estate for technical optic, light, and barricade accessory mount points.

Key Features

Full-Length 16-Inch Velocity Profiles: Maximizes powder burn efficiency on premium and bulk rimfire cartridges, providing extended downrange trajectories and superior grouping parameters.
Dedicated Rimfire Blowback Efficiency: Bypasses gas blocks and tubes entirely, using a reliable blowback bolt design that runs cleaner and requires far less carbon maintenance through high-volume ranges.
Resilient Free-Float M-LOK Architecture: Premium slim profile aluminum rail isolates the barrel from external handling pressure vectors, ensuring continuous point-of-impact accuracy.
Liquid Bath Nitride Hardening: The 4150 Chrome Moly Vanadium steel core features full interior and exterior QPQ Melonite coating to offer absolute weatherproofing and simple carbon cleanup.
100% Sourced & Assembled in the USA: Sourced and built to tight manufacturing metrics in Georgia, backed completely by premium custom-shop engineering quality parameters.

Technical Specifications

Upper Receiver	AR-15 Slick Side Mil-Spec Machined out of Billet Aluminum, Type III Hardcoat Anodized Black
Barrel Length & Profile	16-Inch Medium Profile
Caliber	.22 Long Rifle (Dedicated .22LR Chamber)
Twist Rate	1:16 Twist (Rimfire Standard Optimization)
Barrel Material & Treatment	4150 Chrome Moly Vanadium Steel with QPQ Melonite Nitride Finish
Operating System	Direct Blowback (Gas Block and Tube Omitted for Rimfire Reliability)
Muzzle Thread & Device	1/2x28 Thread Pitch, A2 Flash Hider
Handguard Rail	12" Slim Free-Float M-LOK Handguard, Machined from 6061-T6 Aluminum with Top Picatinny Rail
Manufacturing Origin	100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Who Chooses This Upper Receiver?

Affordable High-Volume Marksmen

Shooters wanting to mirror their duty rifle mechanics choose this full 16-inch system to log endless positional target practice without straining centerfire supply budgets or altering barrel handling metrics.

Rimfire Precision Competitors

NRL22 or casual local precision rimfire challenge entrants select this optimized twist rate and long-sight-radius profile to capture tighter string consistencies across varying distances.

AR-15 Builders Prioritizing Dedication

Custom gunsmiths building a standalone, turn-key rimfire rifle choose this unit over standard drop-in conversions to avoid indexing variances, throat fouling, or accuracy degradation over thousands of round cycles.

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