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Maximize muzzle velocity and downrange ballistics from the 5.56 NATO cartridge without dealing with face-directed gas blast or casing deflection. The PRO2A Left Hand 18" 5.56 NATO Mid-Length NR Side Charging Melonite Upper Kit is a comprehensive, all-in-one assembly package containing a precision left-ejecting upper receiver assembly, a premium non-reciprocating side-charging bolt carrier group (BCG), an aluminum side cocking handle, a full lower parts kit, and a 6-position adjustable stock/buffer group. Built around a versatile 18-inch 4150 CMV steel barrel, this model utilizes an optimized 1:8 twist rate to stabilize a wide spectrum of ammunition weights. The non-reciprocating design means the cocking handle stays fully stationary during live firing, keeping your optics workspace safe and clear. This complete bundle contains every component required to cleanly transform your stripped lower receiver into a finished tactical rifle. Proudly 100% designed, machined, and precision-tested in the USA.
| Upper Receiver | Gibbz Arms G4 LEFT HANDED Non Reciprocating Side Charging Billet Aluminum Receiver with Gen 2 Handle, M4 Feed Ramps, Type III Hardcoat Anodized Black |
|---|---|
| Charging Style | Right-Side Non-Reciprocating Manual Cocking Assembly (Handle Stays Stationary While Firing) |
| Bolt Carrier Group | Left-Handed Milspec, Premium Nitride/Melonite Finish, M16 Profile, Properly Staked Gas Key, MPI Tested |
| Barrel Length & Steel | 18 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Contour, Melonite Treated |
| Caliber | 5.56 NATO (Fully compatible with .223 Remington ammunition) |
| Twist Rate | 1:8 Twist (Optimized to stabilize a massive profile array of light-to-heavy 55gr, 62gr, and 77gr projectiles) |
| Gas Operating Block | Mid-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube |
| Muzzle Device | Standard 1/2-28 Thread Pitch, A2 Flash Hider with Crush Washer Pre-Installed |
| Handguard | 15 Inch Slim Profile Free-Float M-LOK Rail, Full-Length Top Picatinny Rail, Machined from 6061-T6 Aluminum |
| Lower Parts Kit | Mil-Spec Polished Trigger & Hammer, Standard Pistol Grip, Lower Component Springs, and Pins Included |
| Stock Assembly | 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 |
The PRO2A Left Hand 18" 5.56 NATO NR Side Charging Upper Kit directly eliminates the operational frustrations left-dominant shooters experience on standard right-handed rifles: face-directed gas blowback, mirror-image handling gymnastics, and component mismatching. Traditional configurations dump unburnt powder residue and toxic gases directly across a Southpaw shooter's face—a painful issue that grows worse when firing fast strings or running a suppressor. Shifting the physical shell gate permanently solves this problem, ensuring clear vision and pure lung comfort.Furthermore, picking an 18-inch barrel configuration lets you harvest full velocity potential from a lightweight semi-automatic platform, stretching the legs of your rifle past normal distances without Entering restrictive NFA registration fields.
Paired with a static, non-reciprocating side-charging interface, you can clear rare malfunctions or charge your chamber effortlessly without pulling your eye away from your optical cheek weld or reaching over the top of the firearm. By bundling a factory-checked bolt group, a custom barrel assembly, an optimized lower parts group, and a matching buffer spring matrix, you bypass technical compatibility headaches completely. Backed entirely by Pro2A Tactical's signature Lifetime Factory Warranty and engineered with 100% American craftsmanship, this master kit converts your stripped lower receiver into a premium tactical asset with absolute confidence.
| SKU | P2ALNR556AX15MID18-TK-KIT |
|---|---|
| Barrel Length | 18 inch |
| Rifle Caliber | 5.56 NATO |
| Manufacturer | Pro2A Tactical |
