Maxim Defense PDX 505-SPS 5.56 NATO 5.50-inch Pistol

About this product

The Maxim Defense PDX 505-SPS is a compact AR pistol platform built around Maxim’s SCW Pistol System, offering a streamlined rear profile in place of a traditional stock or brace. Chambered for .223 REM/5.56 NATO with a short 5.50-inch barrel, it delivers a highly portable configuration for range use, personal defense, or compact utility applications. The design emphasizes reduced bulk and weight while remaining optic-ready for modern sighting systems. The SCW Pistol System minimizes protruding angles and includes a rear single-point QD swivel mount for sling use.

Key Specifications

• Chambered in .223 REM/5.56 NATO for standard intermediate cartridges.
• The barrel measures 5.50 inches to keep the platform compact.
• The magazine capacity is 20 + 1 rounds.
• The overall length is 18.75 inches for a short-profile package.
• The unloaded weight is 5.10 lbs for a lightweight carry option.
• The grip is made from Arid Brown Polymer for a durable, weather-resistant hold.
• The rear system uses the Synthetic SCW Pistol System for a streamlined back end and single-point QD mounting.
• The action is Semi-Auto for standard semi-automatic operation.
• The sighting platform is Optic Ready to accept a wide range of red dots and optics.
• The finish and furniture are listed as Arid Brown for coordinated metal and polymer coloration.

Compact, lightweight, and purpose-built, the PDX 505-SPS delivers a modern AR pistol experience that prioritizes maneuverability and modular sighting options. Its short barrel and streamlined SCW Pistol System make it well suited for close-quarters range work or any shooter seeking a minimal, efficient AR platform with contemporary features.