Maxim Defense PDX 505-SPS 7.62x39 5.5" Barrel 20+1 Capacity

The Maxim Defense PDX 505-SPS delivers full-size rifle performance in a compact platform, chambered in the proven 7.62x39mm cartridge. This short-barreled rifle bridges the gap between traditional carbines and pistol-caliber platforms with superior ballistic performance.

What Makes This Different

Built on Maxim Defense's proprietary receiver system, the PDX 505-SPS incorporates their patented Hate Brake muzzle device and integrated buffer system. The 5.5-inch barrel maintains effective terminal ballistics while reducing overall length by 6 inches compared to standard 16-inch configurations. This design eliminates the traditional buffer tube extension, creating a more maneuverable package without sacrificing reliability.

Key Features

• 7.62x39mm chambering with 20+1 magazine capacity for proven stopping power
• 5.5-inch barrel with proprietary Hate Brake for recoil mitigation and flash suppression
• Integrated buffer system eliminates traditional buffer tube requirement
• Black polymer grip with textured surface for secure handling
• M-LOK compatible handguard for accessory mounting flexibility
• AR-15 style controls for familiar manual of arms
• Black metal finish provides corrosion resistance and reduced visibility

The PDX platform excels in close-quarters applications where maneuverability matters most. Law enforcement and security professionals appreciate the reduced length for vehicle operations and confined spaces. The 7.62x39mm cartridge delivers consistent expansion and penetration characteristics across various barrier materials, making it effective for both personal protection and professional applications.

Technical Specs

• Caliber: 7.62x39mm
• Barrel Length: 5.5 inches
• Overall Length: Approximately 20 inches
• Magazine Capacity: 20+1 rounds
• Finish: Black metal with black polymer grip
• Handguard: M-LOK compatible aluminum
• Operating System: Direct impingement with integrated buffer
• Weight: Approximately 5.8 pounds (unloaded)
• Manufactured in the United States

The PDX 505-SPS represents a significant advancement in compact rifle design, offering full cartridge performance without the bulk of traditional platforms. Limited production runs and high demand make availability sporadic across most retailers.