PRO2A 18" 6.5 Grendel 1/8 Mid Length Melonite M-LOK AR-15 Upper

Product Overview

The PRO2A 18" 6.5 Grendel 1/8 Mid Length Melonite M-LOK AR-15 Upper brings exceptional long-range performance and flat trajectories directly into the lightweight AR-15 platform. Built around a premium 18-inch 4150 CMV steel barrel with a low-friction Melonite lining, this complete upper assembly is explicitly designed to handle the high ballistic efficiency of the Type II 6.5 Grendel cartridge. Mated to a smooth mid-length gas system to optimize lock time and cycling reliability, it delivers sub-MOA precision ideal for competitive marksmen, varmint management, and medium-game hunting across extended ranges.

Key Features

High-Efficiency 18-Inch Barrel: Extends your operational range by extracting optimal muzzle velocity and downrange terminal energy from intermediate calibers.
Elite QPQ Melonite Core Defense: Liquid liquid nitride coating increases inner and outer surface thickness to drastically extend bore accuracy life and shield against severe outdoor weather.
Precision 1/8 Stabilization Profile: Highly optimized button-rifled twist rate keeps the market's favorite mid-to-heavy grain 6.5 precision projectiles tracking flawlessly.
Regulated Mid-Length Gas Layout: Smoothly balances gas dwell time metrics to dampen physical bolt group impacts, reducing structural parts fatigue and taming felt recoil climb.
Slim Line Free-Float M-LOK Rail: Features an uninterrupted top Picatinny profile and modular side anchoring slots while isolating target barrel harmonics from accessory weight.

Technical Specifications

Caliber / Chamber:	6.5 Grendel (Type II)
Barrel Length:	18 Inches
Barrel Material:	4150 Chrome Moly Vanadium Steel
Twist Rate:	1:8 Twist
Barrel Coating Finish:	QPQ Melonite / Black Nitride Finish
Gas System Length:	Mid-Length System with 0.750" Low Profile Gas Block Layout
Receiver Style:	Mil-Spec Forged 7075-T6 Aluminum, Forward Assist & Port Cover (Type III Hardcoat Anodized)
Bolt Carrier Group (BCG):	Premium M16 Profile BCG with Type II Bolt Face, Nitride Finish, MPI Tested
Muzzle Threads & Device:	5/8x24 TPI; Premium A2 Flash Hider
Handguard Interface:	15 inch Free-Float Ergonomic Slim M-LOK Rail System with Continuous Top Picatinny Footprint
Manufacturing Origin:	100% Made in the USA

Why Choose This Product?

This premium 18-inch complete upper receiver provides modern builders with an elite direct-to-consumer solution that transitions standard intermediate frames into a true long-range precision platform. By pairing a perfectly headspaced Type II bolt carrier group with a robust, Melonite-lined barrel and a smooth-cycling mid-length gas length, it delivers structural consistency and sub-MOA reliability right out of the box. Inspected and precision-fit in the USA, this upper offers an uncompromised balance of light field carry weight, smooth recoil management, and premium ballistic terminal value built for a lifetime of heavy downrange use.