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Build the ultimate ultra-compact backpack gun or defensive platform with the PRO2A 7.5" 300 Blackout Pistol Length Melonite M-LOK Upper Receiver. Engineered specifically to maximize the ballistic efficiency of the 300 AAC Blackout cartridge in short barrels, this 100% American-made upper assembly delivers heavy-hitting power in an incredibly agile form factor. Built on a rugged mil-spec forged 7075-T6 aluminum receiver, it features a hardened 4150 CMV steel barrel and a smooth-cycling pistol-length gas system. Whether you select the versatile 1:7 twist or the fast 1:5 rotational twist for stabilizing heavy subsonic projectiles, this optics-ready upper provides a flawless, premium foundation for your next AR pistol or registered short-barreled rifle (SBR) build.
| Upper Receiver | Mil-Spec Forged 7075-T6 Aluminum, M4 Feed Ramps, Forward Assist & Port Cover, Type III Hardcoat Anodized Black Finish |
|---|---|
| Barrel Length & Steel | 7.5 Inch Profile, 4150 Chrome Moly Vanadium Steel, Medium Contour, Melonite Treated |
| Caliber Configuration | 300 AAC Blackout (7.62x35mm) |
| Twist Rate Options | 1:7 Twist or 1:5 Twist Rate |
| Gas Operating Block | Pistol-Length Gas System, Low-Profile Gas Block Machined from 4140 Steel, Stainless Steel Gas Tube |
| Muzzle Thread Pattern | Standard 5/8x24 Thread Pitch (Includes A2 Flash Hider and Crush Washer) |
| Handguard | 7 Inch Slim Profile Free-Float Aluminum M-LOK Rail, Competition Top Picatinny Rail Alignment |
| Manufacturing Origin | 100% Made in the USA with Pro2A Tactical Lifetime Factory Warranty |
The PRO2A 7.5" 300 Blackout Upper Receiver directly capitalizes on what makes the 300 BLK cartridge legendary: complete powder burn and terminal efficiency inside short barrels. While a 5.56 NATO cartridge suffers severe velocity loss and massive muzzle flash when dropped below 10 inches, the 300 Blackout achieves nearly full ballistic burn inside a compact 7.5-to-9-inch barrel path. This translates into hard-hitting, full-power ballistic expansion out of a platform small enough to fit inside a vehicle console or tactical gear bag.
Pro2A Tactical raises the bar by offering a choice in twist optimization. Standard 1:7 twist options handle traditional projectiles with precision accuracy across all general-purpose use. However, selecting the fast-spinning 1:5 twist profile completely resolves the tumbling or keyholing challenges often caused by firing long, heavy subsonic bullets (such as 220-grain configurations) out of short barrels. By imparting instantaneous stabilization right out of the chamber, the 1:5 twist guarantees tight groupings and ensures safe clearance through a suppressor. Built to exacting tolerances and fully warranted for life, this upper receiver maximizes your AR platform into a dependable close-quarters asset.
| SKU | P2A300BLKACT7PIS75M-TK |
|---|---|
| Barrel Length | 7.5 inch |
| Rifle Caliber | 300 Blackout |
| Manufacturer | Pro2A Tactical |
