The Maxim Defense PDX 505-SPS in 5.56 NATO (brand part no. MXM50803) is a semi-automatic AR-pattern pistol built around a 5.5-inch barrel, delivering the PDX’s compact reliability-focused platform in a black finish. Maxim Defense finishes this SKU in black metal with a matching black polymer grip and equips it with the SCW Pistol System instead of a traditional stock or brace, keeping the rear end free of protruding angles. Among AR-pattern pistols in the AR pistols category, the 505-SPS favors shooters who want a 5.56 subcompact with optic-ready capability.

Key Specifications

• Chambered in 5.56 NATO.
• Operates as a semi-automatic AR-pattern pistol.
• Features a 5.5-inch barrel.
• Feeds from a magazine with a 20+1-round capacity.
• Equipped with the SCW Pistol System rear end.
• Ships optic-ready with no fixed sights.
• Finished in black metal with a matching polymer grip.
• The SCW Pistol System weighs just 5.3 ounces.
• Includes a rear single-point QD swivel mount.

Frequently Asked Questions

What caliber is this pistol chambered in? 5.56 NATO.

Does this pistol include sights? No, it ships optic-ready with no fixed sights.

Buy the Maxim Defense PDX 505-SPS 5.56 Pistol

A compact 5.56 pistol with Maxim’s streamlined SCW Pistol System is exactly what the 505-SPS delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.