Pro2A Tactical

PRO2A 16" 45 ACP 1/16 Pistol Caliber NR Side Charging Melonite M-LOK Upper Kit

Hard-Hitting .45 Caliber Firepower with Modern Stationary Side Cocking Performance

Transform your standard rifle frame lower or dedicated pistol caliber build into a hard-hitting AR-45 platform. The PRO2A 16" 45 ACP Pistol Caliber Non-Reciprocating (NR) Side Charging Upper Kit updates traditional manual platform controls by replacing the standard rear dual-latch pull tab with a left-side cocking lever. The handle stays fully stationary while firing, providing a seamless operating zone free from moving external components near your optic mount. Built around a compliance-friendly 16-inch barrel and engineered for a robust blowback operating system, this comprehensive upper kit comes equipped with Pro2A Tactical's optimized 45 ACP bolt carrier group out of the box and comes with everything needed to complete a stripped lower receiver. Drops natively onto any dedicated AR-45 lower receiver build or standard lower using 45 ACP magazine adapter block conversions. Proudly 100% designed, machined, and precision-assembled in the USA.

Key Features

Stationary Side-Charging Interface: The premium non-reciprocating left-side manual handle operates completely independently from the bolt carrier cycle. This allows for fluid charging from prone or benched layouts and completely seals off the rear opening to block high-pressure gases and debris from venting backward into your face.
Complete BCG Kit Inclusion: Takes the guesswork out of building a pistol caliber carbine. This kit includes a matching premium 45 ACP blowback bolt carrier group engineered to interface flawlessly with the side charging assembly for reliable chambering, extraction, and ignition paths.
Heavy-Hitting .45 ACP Ballistics: Bring the proven stopping power of the .45 Auto round into a highly stable carbine format, picking up extra muzzle velocity over standard handgun platforms while retaining low recoil.
Melonite/Nitride Barrel Protection: The heavy-duty 4150 CMV steel barrel is fully Nitride/Melonite treated inside and out. This premium chemical hardening vastly extends barrel life, aids in uniform thermal dissipation, and counters harsh weather corrosion.
Slim Profile Free-Float M-LOK Rail: Built from durable 6061-T6 aluminum, the free-float handguard completely isolates barrel vibrations to preserve uniform mechanical accuracy while offering extensive M-LOK accessory attachment space and a continuous top Picatinny rail.

Technical Specifications

Upper Receiver	Gibbz Arms G9 Non Reciprocating Side Charging Billet Aluminum Receiver with Gen 2 Handle, Type III Hardcoat Anodized Black
Barrel Length & Steel	16 Inch Profile, 4150 Chrome Moly Vanadium Steel
Caliber	45 ACP
Twist Rate	1:16 Twist (Optimized to stabilize standard 230gr FMJ and heavy defense loads)
Gas / Operating Block	Solid Direct Blowback Operating System (No Gas Tube or Gas Block Needed)
Muzzle Device Config	Standard 45 ACP - 5/8-24 threads, Pre-Installed Flash Hider with Crush Washer
Handguard	12" Slim Profile Free-Float M-LOK Rail, Machined from 6061-T6 Aluminum
Bolt Carrier Group	45 ACP Caliber, M16 Profile, Mil-Spec, MP Tested, Nitride Treated, 8620 Steel 2 Piece Carrier/Bolt
Charging Handle	Integrated Side Charging Handle
Lower Parts	Milspec Polished Trigger & Hammer, Standard Grip & Milspec Lower Parts Kit
Stock	M4 Milspec Stock with 6 position buffer tube, 8oz pistol caliber buffer, pcc buffer spring, latch plate and castle nut
Manufacturing Origin	100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Who Chooses This Upper Receiver Kit?

No-NFA Pistol Caliber Carbine Builders

Shooters wanting the close-quarters impact of a .45-caliber platform but want to completely avoid NFA tax stamps, stabilizing brace legalities, or registration paperwork choose this standard 16-inch rifle-compliant kit setup.

Oversized Optics & Thermal Night Hunters

Hog and predator hunters running bulky low-power variable optics (LPVOs), thermal systems, or complex night vision frames prefer side-charging platforms. The left-side handle clears the wide undersides of scope mounts, protecting hands from scrape damage.

Pistol & Carbine Ammo Unifiers

Enthusiasts who already run a .45 ACP handgun for self-defense select this upper kit to unify their logistics, allowing them to carry one caliber of common ammunition into the field or range lane to feed both platforms.