PRO2A 13.7" 5.56 NATO 1/7 Mid Length Melonite M-LOK AR-15 Upper with Flash Can

Product Overview

The PRO2A 13.7" 5.56 NATO 1/7 Mid Length Melonite M-LOK AR-15 Upper with Flash Can brings an exceptional balance of flat-shooting dynamics, maximum maneuverability, and operator comfort to the AR-15 platform. This premium upper receiver incorporates a highly desirable 13.7-inch profile, designed to reduce standard rifle length without sacrificing critical velocity or reliability. To tame aggressive muzzle blast and redirect concussive forces away from the shooter, the assembly features an integrated project-forward linear Flash Can muzzle device tucked cleanly inside the slimline handguard. It is an optimized configuration for tactical defense, fast transition training drills, and home-defense builds.

Key Features

Linear Flash Can Muzzle Device: Tames severe short-barrel muzzle blast by forcing sound pressure, thermal expansion, and aggressive concussive shock waves directly downrange and completely away from the operator.
Smooth Mid-Length Gas Layout: Significantly decreases port pressure and system recoil velocity compared to carbine gas setups, providing softer cycling, quicker follow-up shots, and reduced internal parts wear.
Compact 13.7-Inch Barrel: Delivers superior handling speeds and seamless indexing in close quarters while retaining high terminal velocity and energy retention.
Versatile 1/7 Twist Rate: Precision-rifled land profile engineered explicitly to rotationally stabilize a vast array of common 5.56mm projectiles, including heavy mil-spec or defensive grain variations.
QPQ Melonite Surface Hardening: Premium Salt Bath Nitride finish shields internal rifling and external steel surfaces against corrosive moisture, rapid thermal transfer, and surface scoring.
Free-Float Slim M-LOK Handguard: Enhances intrinsic accuracy by isolating barrel harmonics, featuring an extended rail structure to partially tuck the flash can for a clean, streamlined look while maximizing modular attachment real estate.

Technical Specifications

Muzzle Device:	1/2x28 Slimline Linear Flash Can (Blast Forwarder Device) Tucked Under Rail
Caliber / Chamber:	5.56 NATO (Accepts .223 Remington projectiles reliably)
Barrel Length & Contour:	13.7 Inches Medium Profile
Barrel Material:	4150 Chrome Moly Vanadium Steel
Twist Rate:	1:7 Twist
Barrel Coating Finish:	QPQ Melonite / Black Nitride Corrosion-Resistant Exterior and Interior Lining
Gas System Length:	Mid-Length Gas System with 0.750" Low Profile Gas Block
Upper Receiver Type:	7075-T6 Forged Aluminum M4 Flat Top Receiver, M4 Feed Ramps, Forward Assist & Port Cover (Type III Hardcoat Anodized)
Handguard Profile:	15 Inch Slim Free-Float Modular M-LOK Rail Layout (Extended layout to partially tuck Flash Can)
Manufacturing Origin:	100% Proudly Made in the USA

Why Choose This Product?

The 13.7-inch barrel profile has rapidly grown in popularity among custom weapon builders for a major reason: it offers the ideal middle-ground compromise. It allows the operator to maintain a short, fast-handling weapon configuration while providing soft-shooting, mid-length gas system performance that is traditionally impossible on shorter 10.5 or 11.5-inch builds. This mid-length cycle configuration drops internal pressure spike severity, drastically increases long-term parts endurance, and results in noticeably flat-shooting muzzle tracking.Shorter tactical uppers often present brutal, un-pleasurable muzzle crack and aggressive lateral concussive shock. By integrating a dedicated linear blast forwarder tucked neatly into a free-float M-LOK rail system, the PRO2A 13.7-inch upper forces unburnt powders and thermal shock completely forward away from the shooter's ears and optical field. Built entirely in the USA using top-tier 4150 steel and hardcoat anodized aluminum components, this drop-in platform bypasses configuration friction to supply a reliable, high-performance tactical upper straight out of the box.