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The PRO2A 13.7" 5.56 NATO Mid Length Non-Reciprocating Side Charging Melonite M-LOK Upper Kit with Pinned & Welded Muzzle Device offers a comprehensive, premium construction bundle engineered to deliver modern weapon logistics. Chambered in reliable 5.56 NATO, this all-in-one rifle assembly package replaces standard rear charging handle configurations with a highly efficient Non-Reciprocating (NR) Side Charging System. This kit includes a side-charging billet upper receiver paired with a matching side-charge bolt carrier group, a complete lower parts kit, and an adjustable carbine stock buffer assembly. Featuring a permanently pinned and welded slimline flash can to securely meet federal compliance lengths without complex regulatory paperwork, it brings specialized tactical ergonomics right out of the box.
| Upper Receiver | Gibbz Arms G4 Billet Aluminum Non-Reciprocating Side Charging Upper Receiver, Right Hand Ejection, M4 Feed Ramps, Anodized Black Finish |
|---|---|
| Charging System | Left-Side Non-Reciprocating Charging System (Static Handle Design) for Right-Eject Configuration |
| Barrel Length & Profile | 13.7-Inch Barrel (Permanently achieves 16-Inch Overall Length via Pinned & Welded muzzle device) |
| Caliber | 5.56 NATO (Safely accepts .223 Remington) |
| Twist Rate | 1:7 Twist |
| Barrel Material & Treatment | 4150 Chrome Moly Vanadium Steel, Premium Corrosion-Resistant QPQ Melonite Nitride Finish |
| Gas Operating Block | Mid Length Direct Impingement, Low-Profile Steel Gas Block, Stainless Steel Gas Tube |
| Muzzle Thread & Device | 1/2-28 "Pro2A Flash Guardian" 3 Prong Flash Hider (Permanently Pinned and Welded) |
| Handguard Rail | 12-Inch Extended Free Float Slim Profile M-LOK Handguard Rail System (Recesses muzzle device cleanly) |
| Bolt Carrier Group | Full Auto M16 Profile, Heavy Duty Bolt Carrier Group, Nitride Treated, Properly Staked Gas Key |
| Lower Parts Kit | Complete AR-15 Lower Parts Kit (LPK) with Fire Control Group, Grip, and Milspec Trigger Setup |
| Stock Assembly | 6-Position Adjustable Carbine M4 Stock with Buffer Tube, Buffer Spring, Castle Nut, and Receiver End Plate |
| Manufacturing Origin | 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty |
Enthusiasts wanting a compact visual and physical properties of a short-barreled tactical setup choose this model to bypass long federal application wait times. The side-charging mechanic simplifies weapon clearing when run with large optics.
Shooters seeking a flat-tracking firearm setup choose the mid-length configuration to reduce muzzle rise during rapid shot strings. Bypassing the traditional charging handle pull path allows users to run immediate action drills faster under intense stress scenarios.
Custom gunsmiths aiming to update a standard small-frame stripped lower into an innovative, highly functional tool select this package. It bundles all critical assembly steps together, providing proper component matching out of a single drop-in assembly array.
| SKU | P2ANR556AX12MID137-BA-KIT-PW |
|---|---|
| Barrel Length | 13.7 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |
