PRO2A Left Hand 20" 6.5 Grendel NR Side Charging Upper Receiver

PRO2A Left Hand 20" 6.5 Grendel 1/8 Rifle Length NR Side Charging Melonite M-LOK AR-15 Upper

Unlock long-range accuracy and matching left-handed ergonomics with the PRO2A Left Hand 20" 6.5 Grendel Non-Reciprocating (NR) Side Charging Upper Receiver. Engineered with 100% American craftsmanship, this premium upper receiver is configured explicitly for southpaw shooters who want maximum terminal energy from the 6.5 Grendel cartridge. Built on a specialized left-hand ejecting, non-reciprocating side-charging platform, this assembly pairs a precision-rifled 20-inch 4150 CMV Melonite barrel with a smooth, soft-shooting rifle-length gas system. This optics-ready upper provides an excellent foundation for medium-to-long-range hunting, tactical setups, and precision target builds.

Key Features

True Left-Handed Ejection: Engineered entirely for left-handed operators, mirroring standard receiver geometry to eject spent casings cleanly out of the left side, far away from the shooter’s face and line of sight.
Non-Reciprocating Side Charger: Eliminates the awkward rear charging handle, placing a fast left-side manual handle that remains completely stationary while the weapon fires to protect your facial weld.
Long-Range Velocity Optimization: Features a full 20-inch barrel length designed to maximize powder burn and achieve optimal muzzle velocity, extending the supersonic effective range of the 6.5 Grendel cartridge.
Premium Melonite Barrel Protection: The heavy-duty 4150 CMV steel barrel is treated inside and out with a premium Salt Bath Nitride/Melonite finish, vastly improving bore life, friction resistance, and anti-corrosion metrics.
Versatile 1:8 Twist Rate: Precision button-rifled twist rate optimized specifically to stabilize popular mid-to-heavy grain 6.5 Grendel ammunition, including 90gr varmint loads up to 123gr and 130gr match projectiles.
Soft-Shooting Rifle Gas System: Pairing a full 20-inch barrel path with a rifle-length gas tube layout drops peak internal pressures, creating a smooth recoil curve that preserves your visual frame between shots.

Technical Specifications

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
Barrel	20 Inch Medium Contour, 4150 Chrome Moly Vanadium Steel, Salt Bath Melonite Coated Interior Bore & Exterior Shell
Caliber	6.5 Grendel (Type II Chamfering Layout)
Twist Rate	1:8 Twist
Gas Operating System	Rifle-Length Gas Network, Low-Profile 4140 Steel Gas Block, Seamless Stainless Steel Gas Tube
Muzzle Device	Standard A2 Flash Hider with Crush Washer Pre-Installed, 5/8x24 Thread Pitch
Handguard	15 Inch Slim Profile Free-Float Aluminum Handguard, Competition Top Picatinny Alignment, Modular M-LOK Attachment Points
Manufacturing Origin	100% Assembled and Quality Checked in the USA with Pro2A Tactical Lifetime Factory Warranty

Why Buy This Product?

The PRO2A Left Hand 20" 6.5 Grendel NR Side Charging Upper addresses the two biggest obstacles left-handed long-range enthusiasts face: dangerous right-side gas blowback and awkward traditional charging positions. Southpaw shooters running standard right-handed AR setups are subjected to unburned gas, sparks, and brass flying directly across their line of vision, a nuisance multiplied when stretching shots out to 500+ yards. This dedicated upper flips the script by offering an authentic left-side ejection path. Furthermore, the non-reciprocating charging handle lets you stay locked onto your optic with your cheek firmly placed against the stock, allowing you to quickly clear a malfunction or cycle the chamber with your dominant left side without completely dropping your posture.

From a performance perspective, pairing the 6.5 Grendel caliber with a 20-inch barrel path allows the cartridge to realize its true long-range purpose. Shorter barrel profiles clip the velocity of the Grendel, limiting its flat-shooting advantages. This full-length, precision button-rifled barrel delivers the muzzle velocity required to maintain supersonic stability over immense distances, while the rifle-length gas setup ensures your bolt carrier speed remains exceptionally smooth and easy on components. Backed by a lifetime factory warranty and constructed with 100% American parts, this upper assembly transforms your custom build into a flat-shooting, ergonomic tactical machine.

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