Maxim Defense PDX Upper 5.56 NATO 5.5″ FDE

The Maxim Defense PDX U.R.G is a compact complete upper receiver designed to install on any Mil-Spec AR lower receiver. It pairs a 5.5″ barrel with an overall length of 14″ to provide a short, maneuverable configuration suitable for close-quarters and compact rifle applications. The assembly incorporates Maxim’s patent-pending HATEBRAKE muzzle booster intended to reduce felt recoil and flash signature. The PDX U.R.G uses a direct impingement operating system and is finished in Flat Dark Earth.

Key Specifications

• The caliber is .223 Rem/5.56 NATO.
• The barrel length is 5.5 inches.
• The model designation is PDX (PDX U.R.G).
• The fit is for AR rifles using a Mil-Spec lower receiver.
• The exterior finish color is Flat Dark Earth.
• The overall length measures 14 inches.
• The muzzle device is the Maxim HATEBRAKE (patent-pending) muzzle booster.
• The operating system is direct impingement.
• The product type is a complete upper receiver.

The PDX U.R.G upper provides a compact, thoughtfully configured option for shooters who require a short-barrel AR upper with a reduced flash and recoil profile. Its combination of a 5.5″ barrel, integrated muzzle booster, and Mil-Spec compatibility makes it a practical choice for applications where a smaller overall package and reliable operation are priorities.