Maxim Defense PDX 505-SPS .300 Blackout Pistol, 5.50″

About this product

The Maxim Defense PDX 505-SPS is a compact AR-style pistol built around Maxim’s SCW Pistol System for a streamlined rear profile. It ships with the SCW Pistol System in lieu of a stock or brace, removing protruding angles that can snag while handling. The SCW Pistol System weighs approximately 5.3 ounces, trimming more than ten ounces compared to the SCW stock. The design includes a rear single-point QD swivel mount positioned for use with a sling.

Key Specifications

• Chambered in .300 AAC Blackout for compatibility with short-range, suppressed, or specialty loads.
• Configured with a reported capacity of 20 + 1 for extended use between reloads.
• Equipped with a 5.50" barrel for a compact overall footprint.
• Overall length measures 18.75 inches for maneuverability in confined spaces.
• Overall weight listed at 5.10 lbs for a balance of stability and portability.
• Action type is Semi-Auto for standard AR-platform operation.
• Includes an Arid Brown Polymer grip for consistent ergonomics and finish match.
• Finished in Arid Brown metal for a cohesive, low-profile appearance.
• Designed optic ready to accept a range of electronic sights and optics.

Compact and purpose-built, the PDX 505-SPS offers a streamlined, sling-ready rear interface and an overall package that suits short-range precision, urban/vehicle carry, or any situation where a compact AR pistol is advantageous. Its combination of a short barrel, high-capacity magazine compatibility, and Maxim Defense’s SCW Pistol System makes it a practical choice for shooters who prioritize maneuverability and modern accessory compatibility.