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20 inch 6.5 Grendel AR-15 Upper kit | NR Side Charging

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

SB Tactical SBA3 AR-15 Brace and Milspec Buffer Tube Kit - FDE

SB Tactical SBA3 Brace + AR-15 Milspec Buffer Tube Kit (FDE)

PRO2A 6" 300 Blackout 1/7 Pistol Length Melonite AR-15 Upper Kit - Suppressor Ready

Special Price $449.99 $639.99
Availability:
In stock
SKU
P2A300BLKBW5PIS6-BA-KIT
PRO2A 6" 300 Blackout 1/7 Pistol Length Melonite AR-15 Upper Kit - Suppressor Ready

PRO2A 6" 300 Blackout 1/7 Pistol Length Melonite AR-15 Upper Kit - Suppressor Ready

Maximize discrete, hard-hitting close-quarters power out of your AR platform with this premium 100% American-made ultra-compact conversion system. The PRO2A 6" 300 Blackout Suppressor-Ready Master Kit anchors a specialized, premium Melonite-treated 4150 CMV micro-barrel to a mil-spec forged upper receiver. Complete with an optimized pistol-length gas system, a free-float M-LOK handguard designed to easily tuck or clear sub-compact cans, a pre-headspaced premium bolt carrier assembly, and a full matching lower build component package, this kit delivers everything required to seamlessly transform any standard stripped lower receiver into an incredibly quiet personal defense weapon or optimized subsonic tactical asset.

Key Features

  • All-In-One Complete Rifle Build Package: Takes the technical guesswork out of specialized assembly. This matching master configuration ships complete with a pre-headspaced side-charging BCG, lower parts kit, polished fire control trigger assembly, and standard adjustable blade setup to finish a stripped lower receiver out of the box.
  • Versatile 1:7 Twist Rate: Precision button-rifled with an optimized 1:7 twist configuration engineered specifically to maximize rotational velocity and stability across a wide span of projectile profiles, ensuring sub-MOA precision on lightweight supersonic training rounds up to heavy, ultra-quiet 220gr subsonic match and defense bullets.
  • Maximized 6-Inch Bore Combustion: The compact 6-inch barrel is custom-tailored around the fast-burning characteristics of the 300 AAC Blackout cartridge, ensuring full powder burning metrics within a micro-profile and saving premium muzzle real estate for an attached suppressor.
  • Melonite/Nitride Barrel Protection: The heavy-duty 4150 CMV steel barrel is fully treated with an advanced Salt Bath Melonite finish inside and out. This premium chemical hardening vastly extends bore life against rapid gas erosion at the port and shields against moisture.
  • Ultra-Smooth Pistol-Length Gas Dwell: Pairing a micro 6-inch barrel with a true pistol-length gas tube drops internal carrier pressure, establishing an exceptionally soft recoil impulse that limits benchrest scope disruption.
  • Slim Profile Free-Float M-LOK Rail: Crafted from premium 6061-T6 aluminum, the free-float rail isolates barrel vibrations to preserve uniform mechanical accuracy while providing massive M-LOK modular real estate.

Technical Specifications

Upper Receiver Standard AR-15 Milspec Forged 7075-T6 Aluminum Receiver with M4 Feed Ramps, Forward Assist & Port Cover - Type III Hardcoat Anodized Black
Charging Handle Standard Milspec Charging Handle
Bolt Carrier Group Premium Milspec, Nitride/Melonite Finish, M16 Profile, Properly Staked Gas Key, MPI Tested
Barrel Length & Steel 6 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Contour, Melonite Treated
Caliber 300 AAC Blackout (7.62x35mm)
Twist Rate 1:7 Twist (Optimized to stabilize standard range, match, and heavy subsonic bullet profiles)
Gas Operating Block Pistol-Length System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube
Muzzle Device Standard 5/8x24 Thread Pitch, A2 Birdcage Flash Hider with Crush Washer Pre-Installed (Suppressor Ready Thread Pattern)
Handguard 5 Inch Slim Profile Free-Float M-LOK Rail, Full-Length Top Picatinny Rail, Machined from 6061-T6 Aluminum
Lower Parts Kit Mil-Spec Polished Trigger & Hammer, Standard Pistol Grip, Lower Component Springs, and Pins Included
Brace Assembly Standard Blade with pistol buffer tube, standard 3oz buffer, buffer spring, latch plate, and castle nut
Manufacturing Origin 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty

Why Choose This Product?

The PRO2A 6" 300 Blackout Melonite Upper Kit directly solves the three biggest hurdles facing precision micro-pistol and SBR builders: optimizing gas system geometry for heavy subsonic loads, uncomfortable manual manipulations beneath low-profile optics, and part-by-part home building tolerances. While short-gassed setups can exhibit jagged, violent operations when stepping up to signature heavy cartridges, Pro2A Tactical marries a micro 6-inch barrel path to a tuned pistol-length gas network. This arrangement balances internal carrier velocities, generating an incredibly soft impulse that lets you track impacts through your optic continuously without losing your frame.

More Information
SKU P2A300BLKBW5PIS6-BA-KIT
Barrel Length 6 inch
Rifle Caliber 300 Blackout
Manufacturer Pro2A Tactical
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