PRO2A 20" 6.8 SPC II Rifle Length Melonite M-LOK AR-15 Upper Kit

PRO2A 20" 6.8 SPC II 1/11 Rifle Length Melonite M-LOK AR-15 Upper Kit

Product Overview

The PRO2A 20" 6.8 SPC II 1/11 Rifle Length Melonite M-LOK AR-15 Upper Kit delivers definitive downrange ballistic performance combined with absolute builder convenience. This all-inclusive master assembly kit provides everything required to convert a standard stripped lower receiver into a high-velocity, mid-to-long range precision hunting or tactical powerhouse. Engineered around a premium 20-inch rifle-length Melonite barrel with optimized SPC II chambering parameters, this drop-in bundle provides an out-of-the-box solution for marksmen looking to extract maximum terminal energy from the intermediate 6.8mm cartridge.

Key Features

Complete All-In-One Assembly Kit: Streamlines your build by bundling a pre-assembled upper, a high-quality caliber-matched bolt carrier group, a complete lower parts kit, and an adjustable stock system.
Velocity Maximized 20-Inch Profile: Full rifle-length barrel design ensures complete propellant burn, extracting maximum muzzle velocity and increased terminal expansion parameters out of the 6.8 SPC II cartridge.
Optimized SPC II Chamber & 1/11 Twist: Engineered to modern SPC II specifications to safely handle higher pressure loadings while utilizing a 1/11 twist rate to accurately stabilize common mid-to-heavy hunting projectile grains.
Ultra-Smooth Rifle Length Gas System: Drastically decreases port pressure spikes and bolt carrier velocity compared to shorter systems, yielding a remarkably soft recoil impulse and fast shot tracking.
QPQ Melonite Surface Hardening: Premium Salt Bath Nitride finish protects internal rifling and external steel surfaces against corrosive moisture, rapid thermal breakdown, and bore friction.
Free-Float Slim Handguard: Enhances intrinsic accuracy by isolating barrel harmonics while supplying modular M-LOK attachment slots and an expansive top Picatinny tracking rail.

Technical Specifications

Charging System:	Standard Mil-Spec Rear Charging Layout
Muzzle Thread Pitch:	5/8x24 TPI Standard A2 Flash Hider
Caliber / Chamber:	6.8 SPC II (Spec II Chamber Standard)
Barrel Length & Contour:	20 Inches Medium Profile
Barrel Material:	4150 Chrome Moly Vanadium Steel
Twist Rate:	1:11 Twist
Barrel Coating Finish:	QPQ Melonite / Black Nitride Corrosion-Resistant Exterior and Interior Lining
Gas System Length:	Rifle-Length Gas System with 0.750" Low Profile Gas Block
Upper Receiver Type:	7075-T6 Forged Aluminum Flat Top Receiver, M4 Feed Ramps, Forward Assist & Port Cover (Type III Hardcoat Anodized)
Bolt Carrier Group (BCG) & Handle:	M16 Profile, Heavy-Duty Carrier, 6.8 SPC Caliber Bolt, Properly Staked Gas Key. Standard Charging Handle
Lower Parts Kit (LPK):	Complete AR-15 Lower Parts Kit (Includes standard polished fire control trigger group, pins, springs, and polymer pistol grip)
Stock Assembly:	6-Position Adjustable Mil-Spec M4 Buttstock, Buffer Tube, Receiver End Plate, Castle Nut, Carbine Recoil Spring, and 3oz Buffer
Handguard Profile:	15 Inch Slim Free-Float Modular M-LOK Rail
Manufacturing Origin:	100% Proudly Made in the USA

Why Choose This Product?

For deer, hog, and predator hunters who require more knockdown power than a standard 5.56 NATO but prefer a lighter, more nimble rifle configuration than a heavy AR-10 platform, the 6.8 SPC II stands as an exceptional choice. Building out a custom variant caliber requires tracking down specialized parts, which often introduces tolerance stack-up and cycling headaches. This PRO2A Master Kit eliminates parts-hunting guesswork by delivering a factory head-spaced upper paired directly with a caliber-matched bolt carrier group, a mil-spec lower parts group, and a matching stock structure.While carbine or pistol-length setups restrict maximum powder combustion and induce snappy recoil, this 20-inch rifle-length barrel captures the full ballistic potential of the 6.8 cartridge for superior downrange precision. The extended rifle gas track delivers a smooth, clean cycling stroke that significantly drops component wear and minimizes muzzle movement. Constructed in the United States from premium 4150 steel and hardcoat anodized aluminum, this comprehensive kit clears away build hurdles to provide custom rifle builders a flat-shooting, precision powerhouse right out of the box.

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