Maxim Defense PDX 505-SPS 5.56 NATO 5.5" Barrel 20+1 Arid Brown

The Maxim Defense PDX 505-SPS delivers maximum firepower in a compact package, engineered for professionals who demand reliability in confined spaces. This 5.56x45mm NATO platform combines a short 5.5-inch barrel with Maxim's proprietary gas system to maintain full-power performance while reducing overall length.

What Makes This Different

The PDX 505-SPS utilizes Maxim Defense's Hate Brake muzzle device and optimized gas system to manage recoil and muzzle blast from the abbreviated barrel. Unlike standard carbines that sacrifice velocity and reliability when shortened, this system maintains consistent cycling across various ammunition weights. The arid brown Cerakote finish provides superior corrosion resistance compared to standard phosphate coatings, rated for 3,000+ hours in salt spray testing.

Key Features

• 5.5-inch barrel with 1:7 twist rate optimized for 55-77 grain projectiles
• Proprietary Hate Brake reduces felt recoil by 68% while minimizing concussion
• Arid Brown Cerakote finish on all metal surfaces for enhanced durability
• 20-round Magpul PMAG included with 20+1 total capacity
• Standard AR-15 magazine compatibility accepts all STANAG pattern magazines
• Picatinny rail system accommodates optics and accessories
• Ambidextrous safety selector and charging handle for enhanced ergonomics

Field testing demonstrates consistent 2-3 MOA accuracy at 100 yards with quality ammunition, making it suitable for close-quarters applications and vehicle operations. The compact 26.5-inch overall length excels in confined spaces while maintaining the stopping power of full-size 5.56 platforms. All-weather reliability comes from the enhanced bolt carrier group and corrosion-resistant finish, proven in desert and maritime environments.

Technical Specs

• Caliber: 5.56x45mm NATO/.223 Remington
• Barrel Length: 5.5 inches with 1:7 twist rate
• Overall Length: 26.5 inches (stock extended)
• Weight: 6.2 pounds unloaded
• Capacity: 20+1 rounds with included magazine
• Finish: Arid Brown Cerakote on metal, matching polymer furniture
• Gas System: Maxim Defense proprietary short-stroke system
• Manufactured in the USA with limited lifetime warranty

The PDX 505-SPS represents proven engineering for tactical applications where space constraints demand compromised dimensions but not compromised performance. Limited production runs and high demand from professional users make immediate availability crucial for serious operators.