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

The Maxim Defense PDX 505-SPS delivers full-rifle performance in an ultra-compact platform, measuring just 18.75 inches overall with its 5.5-inch barrel. This 5.56x45mm NATO chambered firearm bridges the gap between pistol maneuverability and rifle effectiveness for close-quarters applications.

What Makes This Different

The PDX platform utilizes Maxim Defense's proprietary Hate Brake muzzle device and SCW stock system to achieve remarkable compactness without sacrificing ballistic performance. Unlike traditional short-barreled rifles that suffer significant velocity loss, the PDX maintains effective terminal ballistics through advanced engineering. The integrated suppressor-ready threading and optimized gas system ensure reliable cycling with various ammunition weights.

Key Features

• 5.5-inch barrel with 1:7 twist rate for stabilizing heavy projectiles
• Maxim SCW collapsible stock system reduces overall length to 18.75 inches
• Proprietary Hate Brake reduces felt recoil and muzzle rise
• Standard AR-15 magazine compatibility with 20-round capacity
• M-LOK compatible handguard for accessory mounting
• Ambidextrous safety selector and charging handle
• Black polymer grip with aggressive texturing for secure handling

The PDX excels in confined spaces where traditional carbines prove unwieldy. Law enforcement and security professionals benefit from its enhanced maneuverability in vehicles and tight quarters. The platform maintains sub-2 MOA accuracy at 100 yards with quality ammunition, making it viable for precision applications within its effective range. Weather-resistant coatings protect against corrosion in harsh environments.

Technical Specs

• Caliber: 5.56x45mm NATO/.223 Remington
• Barrel Length: 5.5 inches with 1:7 twist
• Overall Length: 18.75 inches collapsed, 22.5 inches extended
• Weight: Approximately 5.8 pounds unloaded
• Capacity: 20+1 rounds (standard AR-15 magazines)
• Finish: Black anodized aluminum, black polymer components
• Thread Pitch: 1/2x28 TPI for suppressors and muzzle devices
• Manufacturing: Made in USA with lifetime warranty

The PDX 505-SPS represents Maxim Defense's commitment to innovative engineering and practical functionality. Its unique combination of compactness and performance addresses real-world operational requirements that standard platforms cannot meet.