PRO2A 5" 5.56 NATO 1/5 Micro Length Melonite AR-15 Upper with Flash Can Kit
Product Overview
The PRO2A 5" 5.56 NATO Micro Length Master Upper Kit challenges traditional sub-compact boundaries by offering extreme maneuverability without shedding critical bullet stabilization. Engineered around an aggressive, ultra-fast 1:5 spin twist rate, this micro barrel extracts peak rotational velocity out of standard 5.56 loads to eliminate tumbling profiles common in short setups. Complete with a muzzle-mounted linear flash can tucked under a free-float handguard, this comprehensive package fully populates your lower configuration right out of the box with an included premium Bolt Carrier Group (BCG), a Mil-Spec lower parts kit (LPK), standard charging handle, and an adjustable rear receiver stabilizing brace assembly.
Key Features
- All-Inclusive Master Build Kit: Bundles the complete barreled upper receiver with a premium bolt carrier group, charging handle, full lower parts kit, and rear receiver stock or pistol brace assembly.
- Ultra-Compact Profile: 5-inch heavy target barrel configuration delivers massive close-range kinetic energy transfer from a highly maneuverable, lightweight footprint.
- Hyper-Stabilized 1:5 Twist Architecture: Incorporates a highly advanced micro twist rate that quickly turns and stabilizes standard and heavy rifle projectiles from a compressed 5-inch ignition window.
- QPQ Melonite Extreme Armor: Barrel bore, chamber, and exterior are fully liquid nitrocarburized to exceed mil-spec chrome lining in surface hardness, heat dissipation, and corrosion resistance.
- Slim Profile M-LOK Workspace: Features a continuous top Picatinny rail interface seamlessly blended into an extended free-floating M-LOK handguard for rigid optics and accessory mounting stability.
Technical Specifications
| Caliber / Chambering | 5.56 NATO (Fully Compatible with .223 Remington) |
|---|---|
| Barrel Length / Steel | 5 Inches / 4150 Chrome Moly Vanadium (CMV) Steel |
| Barrel Finish & Profile | QPQ Melonite / Black Nitride (Internal & External) — Micro Profile |
| Twist Rate / Feed Ramps | Ultra-Fast 1:5 Twist / M4 Extended Feed Ramps Engineered for Flawless Feeding Reliability |
| Gas System Mechanics | Micro Length Direct Impingement with a 0.750" Low-Profile Steel Gas Block |
| Upper Receiver Housing | Forged 7075-T6 Aluminum, Mil-Spec M4 Profile, Type III Hardcoat Anodized, Forward Assist & Dust Cover |
| Handguard System | 7 Inch Ultra-Lightweight Free-Float Aluminum M-LOK Rail System (Tucked Muzzle Look) |
| Muzzle Configuration | Premium Slimline Linear Flash Can / 1/2x28 TPI Thread Pitch |
| Bolt Carrier Group (BCG) | M16 Profile Full-Auto Capable, Case Hardened 8620 Steel Carrier, 9310 Steel Bolt (MPI Tested), Advanced Nitride Finish |
| Charging Handle | Standard Mil-Spec AR-15 Charging Handle |
| Lower Parts Kit (LPK) | Complete AR-15 Lower Parts Kit (Standard Milspec ELG Trigger / Fire Control Group, Pistol Grip, Detents, Springs, Pins, and Safety Selector) |
| Brace & Buffer Assembly | Premium Adjustable Pistol Stabilizing Brace, Pistol Receiver Extension Tube, Carbine Recoil 3oz Buffer, and High-Tensile Buffer Spring |
| Manufacturing Origin | 100% Designed, Machined, and Assembled in the United States |
| Warranty Protection | Backed by Pro2A Tactical's Structural Lifetime Warranty |
Why Choose This Product?
Running a standard 1:7 or 1:9 twist on a micro-length 5-inch 5.56 barrel can lead to keyholing targets and poor bullet velocity tracking. Pro2A Tactical overcomes this completely by leveraging a precise 1:5 twist profile that guarantees correct bullet spin right down the bore line. Paired with a linear flash can that drives blast wave concussion straight downrange rather than slapping back at your face, this master build package provides a reliable, flat-shooting, and deeply satisfying micro carbine platform.
