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The PDX redefined compact firepower in size, durability, and accuracy. With the same heart and soul of the proven PDX, the 508 features an 8.5” barrel, ideal for when maximum concealment and compactness are essential but not as crucial.

The 8.5” barrel delivers higher velocities while the CQB system plays a key role in the compact size. The stock adds a mere 4” to the end of the receiver with a full extension of 8.75”, providing complete comfort to the operator. Our proprietary bolt carrier group and buffer & spring options ensure extreme durability and smooth cycling.

Our MDX series firearms are also equipped with the Maxim’s HATEBRAKE muzzle booster. This patent-pending device significantly reduces recoil, decreases the flash signature, pushes gasses and concussion waves downrange away from the operator, and improves overall performance.


Calibers: 5.56 NATO, 300 BLK, 7.62x39mm
Barrel length: 8.5”Overall length: 21.5” – 23” (collapsed)
Configurations: CQB SBR

Technical Specification

5.56 NATO, 300 BLK, 7.62x39mm
21.5” - 23” (collapsed)
Gen7 CQB

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