Maxim Defense MXM50803 PDX 505-SPS | 5.56 NATO | 5.5in

The Maxim Defense MXM50803 PDX 505-SPS is a compact AR-style pistol chambered in .223 Rem/5.56 NATO with a 5.50″ barrel and a 20+1 magazine capacity. It uses Maxim’s SCW Pistol System to provide a streamlined, low-profile rear end with a rear single-point QD swivel for sling use. The PDX 505-SPS trades the weight and protruding geometry of a stock or brace for a lighter, snag-free interface suited to short-barrel AR platforms. For a reliable optic under $1,000 that pairs well with this platform, consider the Aimpoint PRO red-dot for a durable, sighted solution optimized for close-quarters sighting.

Product Specifications

• The action is Semi-Auto.
• The barrel measures 5.50″ for compact handling.
• The barrel length range is 5″ to 5.99″.
• The caliber is .223 REM/5.56 NATO.
• The capacity is listed as 20 + 1.
• The grip material is Black Polymer.
• The overall length is 18.75″.
• The sights are Optic Ready.
• The stock material is Synthetic.
• The weight is 5.10 lbs.
• The weight range is 5 lbs to 5.99 lbs.
• The UPC is 680017508036.

The PDX 505-SPS is aimed at users who need a compact, controllable AR pistol platform with minimized rear-end bulk and straightforward optic mounting. Its streamlined SCW Pistol System reduces snag points and trims weight compared with a full stock while preserving an AR-style interface for controls and accessories. Common use cases include range training with compact ARs and close-quarters practical shooting where maneuverability and quick sight acquisition matter.

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