PRO2A LEFT HAND 11.5" 5.56 NATO 1/7 Carbine Length Melonite M-LOK AR-15 Upper
Product Overview
Engineered specifically for Southpaw operators, the PRO2A Left Hand 11.5" 5.56 NATO Carbine Length Melonite M-LOK Upper delivers premium, close-quarters performance without compromise. This fully assembled upper receiver brings optimal maneuverability and duty-grade reliability to left-handed firearms users. Built with a robust 11.5-inch 4150 CMV Melonite-treated barrel, this premium upper drops seamlessly onto any standard AR-15 lower receiver configured as a pistol or a registered Short Barreled Rifle (SBR).
Key Features
- True Left-Hand Ejection Port: Mirrored receiver architecture ejects spent casings and harsh blowback gas to the left side, providing a clean, distraction-free sight line for left-dominant shooters.
- Tactical 11.5-Inch Barrel Length: Offers an ideal balance of compact handling and reliable dwell time, serving as a highly maneuverable platform for home defense or vehicle operations.
- Premium Melonite (QPQ Nitride) Finish: The high-grade 4150 CMV barrel features a uniform Melonite layer inside and out, supplying elite defense against bore erosion, extreme heat, and harsh weather.
- Versatile 1:7 Twist Rate: Fast rifling cycle engineered to perfectly stabilize heavy duty and defensive cartridges (62gr to 77gr) while comfortably managing standard 55gr training ammunition.
- Slim Free-Float M-LOK Handguard: A 10-inch lightweight handguard shrouds the barrel to maximize grip real estate while supporting modular M-LOK mounting systems for lights, lasers, and optics.
- Drop-In Operational Readiness: Ships fully assembled, headspaced, and test-fired at the factory.
Technical Specifications
| Caliber / Chamber | 5.56 NATO (Safely fires .223 Remington) |
|---|---|
| Barrel Length | 11.5 Inches |
| Barrel Material | 4150 Chrome Moly Vanadium (CMV) Steel |
| Twist Rate | 1:7 Twist Button Rifled |
| Barrel Finish | Melonite / QPQ Nitride Finish |
| Gas System Length | Carbine-Length Gas System with 0.750" Low Profile Gas Block |
| Upper Receiver | Left-Hand Ejection Billet Aluminum, M4 Feed Ramps, Type III Hardcoat Anodized |
| Handguard | 10" Slim Free-Float M-LOK Handguard (6061-T6 Aluminum) with Full Top Picatinny Rail |
| Muzzle Thread & Device | 1/2x28 TPI; Standard A2 Flash Hider |
| Manufacturing Origin | 100% Made in the USA |
Why Choose the PRO2A Left-Handed 11.5" 5.56 NATO Upper?
An 11.5-inch barrel length is highly regarded in tactical circles for optimizing bullet velocity and reliable gas port pressures in a short-barreled platform. However, for a left-handed shooter, firing a compact system out of a traditional right-hand ejection port causes high-pressure blowback gases and unburnt powder to blow straight into the face. The Pro2A Tactical Left-Hand Upper Receiver Group eliminates this obstacle entirely. By pairing a safe, comfortable left-ejection workflow with a duty-grade Melonite barrel and factory range testing, Pro2A provides a reliable, accurate, and comfortable close-quarters foundation customized specifically for the Southpaw shooter.