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The Maxim Defense PDX was built to answer the SOCOM PDW solicitation, and it shows in every inch of the design. At just 18.75 inches overall with the brace collapsed, this is one of the most compact ways to run 5.56 NATO, period. RECOIL Magazine named it Best of SHOT in 2019, and years later it still stands as the benchmark for the personal defense weapon category. If you need something that maneuvers easily in a vehicle, a hallway, or anywhere space is tight, this is the platform that was engineered for exactly that job.
The trick behind that tiny footprint is Maxim's patented SCW system, which shrinks the entire brace assembly down to 4 inches. It works by integrating the bolt carrier group with interchangeable buffer weights, so you get reliable cycling and tunable recoil behavior without the full-length receiver extension a standard AR needs. The result is quicker follow-up shots and a gun that stays flat under recoil despite its size. Up front, the HATEBRAKE muzzle booster sits tucked under the handguard, cutting felt recoil, knocking down flash, and pushing gas and concussion downrange instead of back at you. That last part matters a lot on a 5.5 inch barrel, where short-barrel blast can get punishing fast.
Maxim didn't cheap out anywhere on this build. The ALG Combat Trigger gives you a clean, predictable pull, and the construction mixes 7075 and 6061 aluminum with titanium and stainless components under a hard anodized finish. At 5 pounds 11 ounces empty, it carries easy and points fast. It runs a direct impingement gas system with familiar AR controls and feeds from standard AR magazines, so there's no learning curve. Range reports consistently note soft recoil and reliable feeding with common 55 grain ammo, which is exactly what you want from a defensive PDW. It ships with a 20 round magazine and a 1/2×28 threaded muzzle ready for your accessories.
The secret is the patented SCW system, which trims the entire brace assembly to just 4 inches. Instead of a standard buffer tube, the bolt carrier group is integrated with interchangeable buffer weights, letting the whole gun collapse to 18.75 inches overall. That's several inches shorter than most AR pistols running conventional receiver extensions.
Yes. The PDX feeds from standard AR magazines and ships with one 20-rounder in the box. The controls follow the familiar AR pattern, so if you've spent time behind any AR-15, you'll feel right at home from the first magazine.
A 5.5 inch barrel in 5.56 produces a lot of muzzle blast, and the HATEBRAKE is Maxim's answer to that. It's mounted under the handguard where it reduces felt recoil, cuts flash signature, and directs gas and concussion downrange away from you. Range testing consistently shows it does a strong job keeping the shooting experience comfortable for a gun this compact.
The PDX runs a direct impingement system tuned specifically for the short barrel, and the interchangeable buffer weights in the SCW system let you fine-tune cycling. The HATEBRAKE booster also helps the gun cycle consistently. Range reviews report flawless function with common 55 grain .223 and 5.56 loads.
| UPC | 680017478032 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MXM-47803 |
| Action | |
| Barrel Length | 5.5" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 20 |
| Color | Black |
| Model | |
| Safety | Manual Safety |
| Product Type | AR |
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