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