Short-barreled .300 AAC Blackout pistols have grown in popularity for shooters who want controllable recoil, reduced muzzle flash, and compact maneuverability. The right platform balances gas system design, muzzle devices, and ergonomics to make those benefits practical in a pistol-sized package.

MAXIM FIREARMS SPS PDX is built specifically to address those tradeoffs with a 5.5″ barrel, 20-round capacity, and an M-LOK free-float forend in an arid/flat dark earth finish. This PDX uses a direct gas impingement system and operates on familiar AR-15 style controls, delivering predictable handling for users already versed in modern sporting platforms.

Design and Key Features

The PDX’s free-float M-LOK forend keeps accessories low-profile while preserving barrel harmonics. The direct gas impingement system is tuned for short-barrel operation, which can be temperamental on some platforms; Maxim’s approach improves cycling consistency. The included Maxim HATEBRAKE muzzle booster is a standout: it reduces felt recoil, decreases flash signature, and directs gases and concussive blast downrange away from the operator—critical when firing suppressed or unsuppressed in close quarters.

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Ballistics and Tactical Applications

.300 AAC Blackout is the clear caliber choice for this build—it offers excellent subsonic performance with heavy bullets for suppressed use and practical supersonic options for short-range stopping power. In a 5.5″ barrel, expect efficient energy transfer at close to intermediate distances, with the HATEBRAKE helping maintain consistent recoil impulse and muzzle signature.

Why Maxim Defense?

Maxim Defense has a reputation for thoughtful small-arms engineering, particularly in compact gas systems and innovative muzzle devices. The SPS PDX carries that pedigree into a pistol format, giving operators a familiar control layout and improved short-barrel reliability.

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Practical Considerations

For defensive or range-minded shooters, the SPS PDX combines compact dimensions with a 20-round magazine for extended capacity. Consider suppressor compatibility, optic height over bore, and compatible ammunition profiles when configuring the pistol for your intended role.

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