Maxim Defense MXM50822 PDX 505-SPS | .300 AAC Blackout | 5.50″

The Maxim Defense PDX 505-SPS (MXM50822) is a compact semi-automatic AR-style pistol chambered in .300 AAC Blackout with a 5.50″ barrel. It uses Maxim’s SCW Pistol System for a streamlined rear profile and includes a rear single-point QD swivel mount for sling attachment. This configuration favors short-range precision and utility roles where a compact, controllable package is required. For this platform a compact red-dot such as the Trijicon MRO pairs well and remains well under $1,000.

Product Specifications

• The manufacturer is Maxim Defense Industries.
• The model is MXM50822 PDX 505-SPS.
• The action is Semi-Auto.
• The caliber is .300 AAC Blackout.
• The barrel measures 5.50 inches.
• The barrel length range is 5 to 5.99 inches.
• The capacity is 20 + 1.
• The overall length is 18.75 inches.
• The weight is 5.10 lbs.
• The grip material is Arid Brown Polymer.
• The stock material is Synthetic.
• The sights are Optic Ready.
• The finish is Arid Brown Metal Finish.
• Features Maxim’s SCW Pistol System with a rear single-point QD swivel mount and the SCW Pistol System weighs approximately 5.3 ounces.
• The UPC is 680017508227.

This PDX 505-SPS is built for users who prioritize a compact, ergonomic AR-pistol platform with modern interface options and a subdued profile. Its short barrel and optic-ready top rail make it suited for controlled short-range work and compact trail or vehicle carry where maneuverability matters. The SCW Pistol System keeps the rear of the firearm low-profile while providing a reliable attachment point for a sling, and the overall specification supports consistent handling and accessory compatibility.