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5 inch 5.56 NATO NR Side Charging Melonite Upper | Pro2A Tactical

PRO2A 5" 5.56 NATO 1/5 Micro Length NR Side Charging Melonite M-LOK AR-15 Upper with Flash Can

 CPD DURAMAG MAGAZINE AR-15 350 LEGEND 20RD BLACK STAINLESS STEEL

CPD DURAMAG MAGAZINE AR-15 350 LEGEND 20RD BLACK STAINLESS STEEL

PRO2A 20" 5.56 NATO 1/7 Rifle Length NR Side Charging Melonite M-LOK AR-15 Upper

Rating:
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Special Price $649.99 $869.99
Availability:
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SKU
P2ANR556AX15RIF20-TK
PRO2A 20" 5.56 NATO 1/7 Rifle Length NR Side Charging Melonite Upper | Pro2A Tactical

PRO2A 20" 5.56 NATO 1/7 Rifle Length NR Side Charging Melonite M-LOK AR-15 Upper

Maximum Ballistic Velocity Meets Advanced Side-Charging Ergonomics

Maximize the full ballistic velocity and capability of the 5.56 NATO cartridge while fundamentally improving your platform's manual of arms. The PRO2A 20" 5.56 NATO Rifle-Length Non-Reciprocating (NR) Side Charging Upper Assembly updates traditional AR-15 operations by moving the charging handle to a heavy-duty, left-side cocking lever. The handle stays fully stationary during live-fire cycling, providing a seamless operating zone free from moving external components near your optic mount or support hand. Built around an extended 20-inch 4150 CMV barrel, this configuration maximizes complete powder burn to drive standard or heavy duty projectiles with flatter trajectories and higher kinetic impact past extended ranges. Drops natively onto any standard Mil-Spec AR-15 lower receiver to anchor a highly precise, soft-recoiling setup. Proudly 100% designed, machined, and precision-assembled in the USA.

Key Features

  • Stationary Side-Charging Handle: 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 from venting from the back of the receiver into your face.
  • Maximized 20-Inch Muzzle Velocity: The full 20-inch barrel profile ensures complete powder combustion, driving standard or heavy 5.56 NATO projectiles to their optimal velocity metrics to stretch out field target parameters and minimize downrange wind drift.
  • 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 against aggressive high-velocity friction, optimizes heat dissipation during long strings, and shrugs off harsh outdoor elements.
  • Ultra-Smooth Rifle-Length Gas Dwell: Tuning a 20-inch barrel with a true rifle-length gas tube significantly lowers port pressure and slows the bolt carrier cycle. The results are an exceptionally soft recoil pulse, reduced parts fatigue, and effortless sight-picture tracking.
  • 15-Inch Free-Float M-LOK Rail: Built from rigid 6061-T6 aluminum, the slim free-float rail isolates barrel harmonic stress to lock in uniform mechanical accuracy while offering expansive real estate for bipods, lights, and an uninterrupted top Picatinny configuration.

Technical Specifications

Upper Receiver Gibbz Arms G4 Non Reciprocating Side Charging Billet Aluminum Receiver with Gen 2 Handle, M4 Feed Ramps, Type III Hardcoat Anodized Black
Barrel Length & Steel 20 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Weight Contour, Melonite Treated
Caliber 5.56 NATO (Compatible with .223 Remington ammunition)
Twist Rate 1:7 Twist (Optimized to stabilize heavy duty 62gr, 69gr, and 77gr match ammunition)
Gas Operating Block Rifle-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
Handguard 15" Slim Profile Free-Float M-LOK Rail, Machined from 6061-T6 Aluminum
Manufacturing Origin 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Who Chooses This Upper Receiver?

Extended Range & Benchrest Marksmen

Shooters wanting to push small-frame limits with a hard-running Melonite assembly select this 20-inch setup. It extracts full ballistic velocity from the cartridge, ensuring high kinetic energy retention and clean, predictable placement past standard carbine ranges.

Oversized Optics & Thermal Night Hunters

Predator and coyote hunters running bulky low-power variable optics (LPVOs), complex night vision setups, or wide thermal sights prefer side-charging platforms. The left-mounted handle leaves massive clearance space below the scope base, preventing scraped knuckles against large mounts.

Enthusiasts Building a Soft-Recoiling Platform

Custom builders who appreciate a smooth operating cycle love the mechanical harmony of a 20-inch barrel combined with a rifle-length gas tube. The configuration decreases bolt carrier velocity for an incredibly flat-shooting, low-concussion bench experience.

More Information
SKU P2ANR556AX15RIF20-TK
Barrel Length 20 inch
Rifle Caliber 5.56 NATO
Manufacturer Pro2A Tactical
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