Maxim Defense Pdx Upper 300blk 5.5" Rifle

The Maxim Pdx Upper 300blk 5.5" Blk is purpose-built for operators requiring the ballistic advantages of the .300 Blackout cartridge in an ultra-compact footprint. Designed for close-quarters battle (CQB) and executive protection details, this upper receiver group bridges the gap between a submachine gun's size and a rifle's terminal performance. It provides a significant tactical advantage for those operating in confined spaces or vehicle-borne environments where maneuverability is non-negotiable.

This system features a 5.5-inch barrel optimized to maintain reliable cycling and accuracy despite its shortened profile. The integration of the .300 Blackout chambering allows for efficient powder burn in short barrels, ensuring that shooters maximize the energy potential of both supersonic and subsonic loads. The black finish provides a durable, non-reflective surface suitable for duty use, while the overall construction adheres to Maxim Defense Industries' rigorous standards for structural integrity.

The Maxim Pdx Upper 300blk 5.5" Blk is an ideal choice for enthusiasts and professionals looking to upgrade their existing PDW platforms or build a specialized short-barreled rifle. Its compact 18.6-inch overall length makes it highly portable, fitting easily into discreet carry bags for low-visibility operations. Users will find this upper compatible with standard AR-15 pattern lowers, though it is specifically engineered to excel when paired with Maxim’s proprietary stock and buffer systems for peak reliability.