The ATI ATIGAX3007ML Alpha Maxx is a 300 Blackout pistol-caliber firearm built around a receiver platform designed for shooters who want a compact, modular platform in a cartridge built for short barrels and suppressed fire. This 300 Blackout receiver features an 8.50" Picatinny rail system that gives you plenty of real estate to mount optics, lights, or other tactical accessories without the bulk of a rifle-length upper. With a 30+1 capacity, you get serious firepower in a package that's genuinely portable—ideal for home defense, range work, or truck gun duties where you need stopping power without sacrifice.
The polymer brace keeps the overall footprint tight while maintaining a natural shooting interface. The flat-top Picatinny rail receiver is the foundation for whatever direction you want to take this build: go minimalist, add a red dot and light, or outfit it for low-light work. 300 Blackout was engineered to shine in short barrels, especially when suppressed, and this compact receiver layout makes it easy to realize that design's full potential.
If you're building a truck gun, a lightweight home-defense carbine, or testing the 300 Blackout platform in a serious but short form factor, this receiver is a solid starting point. The Picatinny rail gives you real mounting flexibility—no proprietary nonsense—and the black polymer furniture stands up to hard use.
| Brand | ATI Ammunition |
| Model | ATIGAX3007ML |
| Caliber | 300 Blackout |
| Capacity | 30+1 |
| Rail Length | 8.50" |
| Rail Type | Picatinny |
| Brace Material | Black Polymer |
The flat-top Picatinny rail accepts any standard Picatinny-mounted optic. Compatibility with specific parts depends on your build configuration, so verify dimensions and interface standards as you source upper and lower components.
300 Blackout is chambered for both subsonic and supersonic loads. The cartridge was designed to perform across that spectrum, especially in short barrels like this 8.50" platform.
You receive the ATI ATIGAX3007ML receiver with the polymer brace and Picatinny rail system as described. Optics, ammunition, and other components are sold separately.
Firearm laws vary by state and change frequently. Verify local and federal regulations before purchase—especially regarding receiver types, braces, and 300 Blackout in your jurisdiction.
American Tactical Imports
