The Zeus Arms Aristaeus is an AR-style pistol chambered in .300 AAC Blackout with an 8-inch barrel and an SBA3 brace in place of a shoulder stock. It uses AR-style controls and magazine compatibility, keeping the manual of arms familiar to that platform. An optic-ready top rail is included for mounting a red dot, and the short barrel keeps the overall package compact for a pistol-length build. 
 

Key Specifications 

• Brand: Zeus Arms 
• Model: Aristaeus 
• Caliber: .300 AAC Blackout 
• Action: Semi Auto 
• Barrel Length: 8 in 
   

Detailed Features 

• SBA3 brace attaches to the buffer tube for added stability without a shoulder stock 
• AR-style controls and magazine compatibility keep operation familiar to that platform 
• Optic-ready top rail accepts a red dot or similar sighting option 
• Chambered in .300 AAC Blackout, which runs both subsonic and supersonic loads 
• The 8-inch barrel keeps the pistol short and easy to maneuver 

Boutique AR pistol builders like Zeus Arms tend to draw a mix of opinions: owners who get a well-assembled unit report reliable cycling and clean function, while others note that quality can be less consistent than from a larger, more established manufacturer. Buyers on this platform are usually encouraged to run the gun a few hundred rounds before judging it fully.

The SBA3 brace and short barrel combination is popular for close-range and home-defense use, since the compact size makes the pistol easy to maneuver indoors. Owners generally like that it keeps AR-style ergonomics and controls, so there is little learning curve for anyone already familiar with the platform.

Chambered in .300 AAC Blackout, the pistol benefits from a caliber with a strong aftermarket for ammunition, and standard AR magazines keep feeding costs down. As with most AR pistols built by smaller shops, some buyers weigh the price against simply building a similar configuration themselves from parts.