Maxim Defense MDX 508 8.5″ Black .300BLK Pistol

Maxim Defense MDX 508 8.5″ Black .300BLK Pistol


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When being super compact isn’t as necessary, but you want to stay on the smaller side, the MDX 508 has your back.


The PDX redefined compact firepower in terms of size, durability, and accuracy. The next size up in the MDX family is the 508. 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 important, but not as crucial.


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


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

Additional information

Weight 11.50 lbs
Dimensions 14 × 5 × 26 in


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