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The Maxim Defense PDX started life chasing the SOCOM PDW solicitation, and that Tier 1 DNA shows up in every part of this complete upper. Chambered in .300 AAC Blackout with a 5.5-inch barrel, it drops onto any Mil-Spec lower and turns it into a genuinely compact personal defense setup. The whole upper runs about 14 inches long, which is what makes .300 Blackout such a natural fit here since the round was designed to deliver serious energy out of short barrels where 5.56 tends to fall flat.
Up front you get Maxim's HATEBRAKE muzzle booster, installed neatly under the handguard rather than hanging off the end. It's a patent-pending device that cuts felt recoil, tames the flash signature, and pushes gas and concussion forward and away from you. On a barrel this short that matters a lot, because unbraked short-barrel .300 Blackout can be loud and punchy. The HATEBRAKE keeps things more manageable and helps the gun run reliably shot to shot.
Maxim doesn't cut corners on materials here. The assembly uses a mix of 6Al-4V titanium, 17-4 stainless steel, and 7075 and 6061 aluminum, with a Type-III hard anodized finish in the Arid Earth colorway. The M-slot compatible handguard gives you room to mount lights, lasers, or a grip, and the HK-height rail up top adds rigidity to the receiver for more consistent shooting. It runs a standard direct impingement operating system, so maintenance and parts stay familiar.
This is a complete upper, meaning it's ready to pin onto your lower and go. It runs a Maxim Mil-Spec BCG or a PDX/SCW compatible BCG, giving you a bit of flexibility depending on how you want to configure your build. If you've been wanting a short, hard-hitting .300 Blackout that leans on real-world PDW engineering, the PDX upper is about as purpose-built as they come.
Yes. It's a complete upper assembly designed to install on any Mil-Spec lower receiver, so you just pin it on and you're ready to run. It includes the barrel, handguard, HATEBRAKE, and bolt carrier group. You'll supply your own lower, buffer system, and charging handle depending on your build.
.300 Blackout was designed specifically to perform well out of short barrels, which is exactly what the PDX is. Where 5.56 loses a lot of velocity and energy from a 5.5-inch barrel, .300 Blackout retains its punch and cycles reliably. That makes this caliber and barrel length pairing a smart match for a compact, close-quarters setup.
The HATEBRAKE is a patent-pending muzzle device that reduces felt recoil, cuts down the flash signature, and directs gas and concussion forward, away from you. On a short barrel like this it makes a real difference in shootability and helps the upper run reliably. It's installed under the handguard rather than sticking out past the muzzle.
The complete PDX upper measures about 14 inches long with the 5.5-inch barrel. That short footprint is a big part of why it works so well for compact, close-quarters and personal defense builds. Once mounted to a lower with a stock or brace, the total length stays manageable for a platform this capable.
| UPC | 680017478261 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MXM-47826 |
| Barrel Length | 5.5" |
| Product Type | Upper |
| Model | |
| Color | Flat Dark Earth |
| Caliber/Gauge | .300 AAC Blackout |
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