Maxim Defense PDX 505-SPS 5.56 NATO 5.50″ Barrel 20+1

The Maxim Defense PDX 505-SPS is a compact AR-format pistol chambered in 5.56x45mm NATO. It pairs a 5.50" barrel with Maxim’s streamlined SCW Pistol System to minimize rearward profile and reduce snag points on gear. The package ships in an Urban Grey metal finish with an Urban Grey polymer grip and is optic-ready for modern sighting systems. This configuration is intended for shooters who value compact handling, modularity, and a manageable balance of capability and control.

Key Specifications

• The caliber is .223 REM/5.56 NATO.
• The barrel measures 5.50 inches.
• Magazine capacity is 20 + 1.
• The overall length is 18.75 inches.
• The weight is 5.10 lbs.
• The action is Semi-Auto.
• The sighting setup is Optic Ready.
• The grip material is Urban Grey Polymer.
• It features Maxim’s SCW Pistol System for a low-profile rear interface.
• The metal finish is Urban Grey.

With its short 5.50" barrel, optic-ready top rail and Maxim SCW Pistol System, the PDX 505-SPS delivers a compact, purpose-built AR-format pistol that balances maneuverability and capacity. The combination of proven 5.56 NATO performance and a streamlined rear system makes this model a practical choice for shooters who require a concise platform with modern accessory compatibility and a focus on handling.

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