Maxim Defense Pdx Upper 5.56 5.5" Pistol

The Maxim Defense Pdx Upper 5.56 5.5" Pistol is a compact upper receiver assembly designed for tactical professionals who require a high-velocity caliber in a compact footprint. It is particularly suited for close-quarters battle (CQB), vehicle-borne operations, and executive protection details where speed and discretion are essential. This upper assembly is engineered to handle the unique gas pressures and dwell time challenges associated with a 5.5-inch barrel.

Its robust construction ensures reliable cycling and durability under high rates of fire, meeting the specifications required for duty use. The Maxim Pdx Upper offers a highly maneuverable front end that excels in tight spaces, making it ideal for home defense enthusiasts and professional operators. As a complete upper receiver assembly, it provides a drop-in solution for those building a specialized short-barreled firearm.

With compatibility for AR-15 platforms, this upper assembly is designed to enhance the performance of your firearm while maintaining a compact profile. Its semi-automatic operation and 5.56 NATO caliber make it a versatile choice for various applications. Whether for personal defense or tactical use, the Maxim Defense Pdx Upper is engineered to meet the demands of modern shooters.