The Maxim Defense PDX Pistol .300 AAC Blackout 5.5 in 20rd is built for the tight corners and close quarters a ranch hand or rural worker faces every day. Chambered in .300 Blackout, this compact semi-auto pistol keeps your loadout short and your firepower ready. With a 5.5-inch threaded barrel and a 20-round magazine, it’s a tool that works when you need it most, without extra bulk or fuss.
Specifications
| Manufacturer | Maxim Defense |
|---|---|
| Model | PDX Pistol |
| Material | 7075-T6 aluminum upper and lower receiver, steel barrel (per manufacturer specs) |
| Compatibility | .300 AAC Blackout ammunition, AR-15 lower parts |
| Finish | Hard anodized Flat Dark Earth |
| Weight | 5.2 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- SCW Pistol System: Integrates a bolt carrier group with interchangeable buffer weights to reduce recoil and speed up follow-up shots. This means you stay on target faster in tight quarters.
- 5.5-inch Threaded Barrel: Short enough to maneuver in confined spaces, yet threaded for suppressor or muzzle device attachment. Lets you adapt to noise discipline or flash suppression needs.
- Two-Piece MDX Handguard with M-LOK: Provides a stable mounting platform for lights, lasers, or grips without adding weight. Keeps your accessories secure during hard use.
- Maxim HATEBRAKE Muzzle Booster: Positioned under the handguard to direct blast forward, reducing felt recoil and noise at the shooter’s ear. Improves control without lengthening the profile.
- 20-Round Magazine: Gives you enough capacity for patrol or varmint control without the bulk of a full-size rifle mag. Balances firepower with compact carry.
Who It’s For
This pistol is built for ranchers, rural workers, and utility buyers who need a compact, reliable firearm for close-range defense, predator control, or vehicle carry. It’s not a range toy — it’s a working tool for those who spend their days in tight brush, barns, or trucks. If you need something that fits in a saddlebag or behind a truck seat and still hits hard, this is it.
Pros & Cons
- Pro: Ultra-compact design fits in tight storage spaces like truck consoles or backpacks.
- Pro: .300 Blackout delivers good stopping power at short ranges, ideal for varmints or two-legged threats.
- Con: Shorter barrel reduces velocity for .300 Blackout compared to longer barrels, so maximum effective range is limited to about 150 yards. For close-quarters work, that’s fine, but don’t expect long-range precision.
- Con: Price point is high for a pistol platform, but the SCW system and build quality justify it for serious users.
Comparison: Maxim Defense PDX vs Zev Technologies OZ9 vs Geissele Super Duty Pistol
| Feature | Maxim Defense PDX | Zev Technologies OZ9 | Geissele Super Duty Pistol |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 9mm | 5.56 NATO |
| Barrel Length | 5.5 in | 4.5 in | 11.5 in |
| Capacity | 20 rounds | 17 rounds | 30 rounds |
| Weight (unloaded) | 5.2 lbs | 1.8 lbs | 5.8 lbs |
| Recoil System | SCW with buffer weights | Standard recoil spring | Standard carbine buffer |
| Best Use | Close-quarters, confined carry | Competition, concealed carry | Patrol, home defense |
The PDX stands out with its .300 Blackout chambering and SCW system, making it a better fit for rural work where you need compact power. The OZ9 is lighter and cheaper but lacks the rifle-caliber punch. The Super Duty is longer and heavier, better for open spaces. For tight quarters, the PDX wins.
Frequently Asked Questions
Is the Maxim Defense PDX pistol legal to own?
Yes, it is classified as a pistol under federal law. Check your state and local laws regarding barrel length, overall length, and magazine capacity. Some states may have restrictions, so verify before ordering.
Can I use subsonic .300 Blackout ammo in this pistol?
Yes, the PDX cycles subsonic .300 Blackout reliably, especially with the HATEBRAKE muzzle booster. For best performance, use quality ammunition and ensure the suppressor is properly attached if you choose to suppress it.
What is the effective range of the PDX?
With a 5.5-inch barrel, effective range is about 150 yards for accurate shots. Beyond that, velocity drops significantly. This is a close-quarters tool, not a long-range rifle.
Does the PDX come with a brace or stock?
It ships as a pistol with a stabilizing brace. Per current ATF regulations, this is legal. Always stay updated on brace rulings in your jurisdiction.
Why Buy from Us
- ✔ Nationwide delivery (all 50 states) — we ship to your FFL
- ✔ Ships 1-2 business days — fast turnaround from our warehouse
- ✔ 30-day returns — no hassle if it’s not right for you
- ✔ Secure checkout — your info stays safe
Looking for more options? Check out our AR Pistols or .300 Blackout Pistols.
Last updated: April 2026
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This Maxim Defense PDX Pistol .300 AAC Blackout 5.5 in 20rd is ideal for shooters looking to buy guns online with confidence. Built with precision engineering and tested performance, it’s a top-tier choice whether you're looking for home defense, sport shooting, or a trusted everyday carry.
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