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Unlock true flat-shooting, intermediate ballistic performance out of your AR-15 platform with this premium 100% American-made conversion system. The PRO2A 13.7" 5.56 NATO Master Kit anchors a match-ready, premium Melonite-treated 4150 CMV barrel to a high-end Gibbz Arms G4 non-reciprocating billet upper receiver. Complete with an ultra-smooth mid-length gas block system, a slim free-float M-LOK handguard, a pre-headspaced side-charging bolt carrier assembly, a blast-forwarding flash can, and a full matching lower build component package, this kit delivers everything required to seamlessly transform any standard stripped lower receiver into an optimized hunter or precision tactical asset.
| Upper Receiver | Gibbz Arms G4 Non Reciprocating Side Charging Billet Aluminum Receiver with Gen 2 Handle, M4 Feed Ramps, Type III Hardcoat Anodized Black |
|---|---|
| Charging Style | Left-Side Non-Reciprocating Manual Cocking Handle Assembly (Stays Stationary While Firing) |
| Bolt Carrier Group | Premium Milspec, Nitride/Melonite Finish, M16 Profile, Properly Staked Gas Key, MPI Tested |
| Barrel Length & Steel | 13.7 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Contour, Melonite Treated |
| Caliber | 5.56 NATO (Fully compatible with .223 Remington) |
| Twist Rate | 1:7 Twist (Optimized to stabilize standard range, match, and heavy combat bullet profiles) |
| Gas Operating Block | Mid-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube |
| Muzzle Device | Standard 1/2x28 Thread Pitch, Slimline Multi-Slot Linear Flash Can Hardcoat Anodized Pre-Installed |
| Handguard | 15 Inch Slim Profile Free-Float M-LOK Rail, Full-Length Top Picatinny Rail, Machined from 6061-T6 Aluminum (Tuck Design Over Flash Can) |
| Lower Parts Kit | Mil-Spec Polished Trigger & Hammer, Standard Pistol Grip, Lower Component Springs, and Pins Included |
| Brace Assembly | Standard Blade with pistol 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 |
The PRO2A 13.7" 5.56 NATO NR Side Charging Melonite Upper Kit with Flash Can directly solves the three biggest hurdles facing modern tactical builders: optimizing gas system geometry for low-recoil control, uncomfortable manual manipulations beneath large scopes, and part-by-part home building tolerances. While short-barreled setups can exhibit violent operations, Pro2A Tactical marries a balanced 13.7-inch barrel path to a smooth mid-length gas network. This arrangement dampens internal carrier velocities, generating an incredibly soft impulse that lets you track impacts through your optic continuously without losing your frame.
| SKU | P2ANR556GFS15MID137CAN-BA-KIT |
|---|---|
| Barrel Length | 13.7 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |
