Pro2A 8.5" 40 S&W NR Side Charging Melonite M-LOK Upper | AR-40

PRO2A 8.5" 40 S&W 1/16 Pistol Caliber NR Side Charging Melonite M-LOK Upper

Description

The Pro2A Tactical 8.5-inch .40 S&W Non-Reciprocating (NR) Side Charging Complete Upper Receiver assembly balances exceptional ballistic velocity with optimized handling speed on the AR-40 platform. Hand-assembled and quality verified in Georgia, this system upgrades weapon control by replacing the traditional rear charging handle with an advanced, static side-charger mechanism. Utilizing an 8.5-inch Melonite barrel calibrated to squeeze excellent velocity thresholds out of standard defensive and training loads, it provides a premium drop-in solution for home defense configurations, personal defense weapons, or compact truck guns.

Key Features

Non-Reciprocating Side Charging: Enhances deployment ergonomics with a left-side charging handle that stays static while cycling, preventing optics obstruction and knuckle interference.
Optimized 8.5" Ballistic Run: Maximizes the powder burn efficiency of the .40 S&W cartridge to unlock higher velocity thresholds while retaining compact weapon control.
Straight Blowback Reliability: Engineered completely without gas blocks or gas tubes, dropping complex wear points to guarantee steady feeding and extraction cycles with heavy loads.
Premium Melonite Hardness: The 4150 steel barrel is treated inside and out with an ultra-hard Melonite finish, providing extreme corrosion resistance and an easily cleaned bore surface.

Technical Specifications

Upper Receiver	Gibbz Arms G9 Billet Aluminum M4 Flat Top Side Charging Receiver, Ejection Port Optimized for Pistol Calibers, Enhanced Feed Cone (Type III Hardcoat Anodized)
Charging System	Left-Side Non-Reciprocating Charging System (Static Handle Design)
Barrel Length & Profile	8.5-Inch Medium Profile
Caliber	.40 S&W (Smith & Wesson)
Twist Rate	1:16 Twist
Barrel Material	4150 Chrome Moly Vanadium Steel with Premium Corrosion-Resistant Melonite Finish
Gas System Length	Not Needed - Straight Blowback Operation
Handguard	7 Inch Free Float Slim Profile M-LOK Rail System with Integrated Top Picatinny Rail
Muzzle Thread & Device	9/16x24 Thread Pitch with Standard A2 Flash Hider

Why Choose This Product?

Stepping up to a side-charging layout dramatically changes operational speed and leverage on hard-hitting pistol-caliber platforms where frame real estate is limited. The Pro2A 8.5" .40 S&W NR Side Charging Upper Receiver matches its premium billet architecture to a factory-headspaced blowback bolt configuration to handle cyclic chamber pressures safely and smoothly. Engineered with a revised feed cone optimized for flat-nose target rounds and high-expansion defense loads alike, it eliminates feeding hiccups natively. It is the definitive choice for operators searching for custom-tier rigidity and ultimate portable stopping power.