The Maxim Defense PDX is a semi-automatic AR-pattern pistol chambered in .300 Blackout with a 5.5-inch barrel in a short-barreled configuration; transfer requires additional federal paperwork depending on configuration. It holds 20 rounds and ships with one magazine. The PDX has an anodized flat dark earth finish with an M-Lok compatible handguard and ships with an SCW pistol brace. 
 

Key Specifications 

• Brand: Maxim Defense Industries 
• Model: PDX 
• Caliber: .300 Blackout 
• Action: Semi Auto 
• Barrel Length: 5.5 inches 
• Capacity: 20 rounds 
• Color/Finish: Flat Dark Earth (Arid) 
   

Detailed Features 

• SCW (Super Compact Weapon) pistol brace 
• M-Lok compatible handguard 
• HATEBRAKE muzzle brake 
• ALG Combat trigger 
• Manual safety

Owners of the Maxim PDX gravitate toward it because of its compact form factor in .300 Blackout, which pairs well with suppressor use at short barrel lengths. The HATEBRAKE is a polarizing muzzle device; in a confined space without a suppressor, the blast signature is significant, and that comes up in nearly every owner review.

The ALG Combat trigger is seen as a practical upgrade over mil-spec, and owners generally note it as a positive over similarly priced compact AR pistols. The SCW brace gets praise for the short folded length, though a few owners find the adjustability takes some getting used to compared to a fixed-length buffer stock.

At the PDX's price point, buyers expect a premium fit and finish, and the majority report the anodizing and build quality meet that expectation. The criticism that surfaces most often is limited aftermarket support for Maxim's proprietary SCW buffer system compared to standard AR parts.