The Maxim Defense PDX 505-SPS 5.56 NATO 5.50-inch Pistol is a compact AR platform that shrinks your footprint without sacrificing reliability. Built around Maxim’s SCW Pistol System, this pistol swaps out a traditional stock or brace for a sleek, low-profile rear end. Chambered for .223 REM/5.56 NATO, its short 5.50-inch barrel makes it easy to stow in a range bag or vehicle. It’s optic-ready and ready to run right out of the box.
| Manufacturer | Maxim Defense |
|---|---|
| Model | PDX 505-SPS |
| Material | 7075-T6 aluminum upper and lower receiver, steel barrel (per manufacturer specs) |
| Compatibility | .223 REM / 5.56 NATO ammunition, standard AR-15 magazines |
| Finish | Hardcoat anodized black |
| Weight | 5.2 lbs (unloaded, per Maxim Defense specs) |
| Condition | New |
Key Features
- SCW Pistol System: Replaces a bulky brace or stock with a compact, streamlined rear profile. This cuts overall length and snag points, making it easier to handle in tight spaces.
- 5.50-inch Barrel: Keeps the package short and light while still delivering effective .223/5.56 performance. You get a highly portable setup for range trips or home defense.
- Optic-Ready Upper: No iron sights included, but the flat-top receiver accepts any modern red dot or magnified optic. You can mount your preferred sighting system without extra adapters.
- Rear Single-Point QD Swivel Mount: Built into the SCW system for quick sling attachment. This lets you carry the pistol hands-free or stabilize it for more accurate shots.
Who It’s For
This pistol fits shooters who want a compact, easy-to-maneuver AR platform without the weight and length of a full rifle. It’s great for families teaching new shooters the AR platform in a smaller package, for personal defense in the home, or for anyone who needs a truck gun that stows away neatly.
Pros and Cons
- Pro: Extremely compact and lightweight—easy to carry, store, and handle for smaller-framed shooters.
- Pro: SCW system eliminates the need for a bulky brace, reducing overall length and snag points.
- Pro: Optic-ready design lets you customize sight setup.
- Con: Short barrel means reduced velocity compared to a 16-inch rifle—expect a drop in effective range for long-distance shooting. This is a trade-off for portability.
Comparison vs Competitors
| Feature | Maxim Defense PDX 505-SPS | Zev Technologies OZ9C | Geissele Super Duty Pistol |
|---|---|---|---|
| Caliber | .223 REM / 5.56 NATO | 9mm Luger | 5.56 NATO |
| Barrel Length | 5.50 inches | 4.5 inches | 11.5 inches |
| Weight | 5.2 lbs | 1.9 lbs | 6.0 lbs |
| System | SCW Pistol System (no brace) | Standard pistol frame | Standard AR brace |
| Price | $2,245.50 | $1,399.00 | $1,895.00 |
FAQ
Is this pistol legal to own without a tax stamp?
Yes. The Maxim Defense PDX 505-SPS is classified as a pistol under federal law, so it does not require a National Firearms Act (NFA) tax stamp. Always check your state and local laws before purchasing.
What kind of accuracy can I expect from a 5.50-inch barrel?
With quality .223 or 5.56 ammunition, you can expect 2-3 MOA groups at 50 yards. The short barrel is optimized for close-quarters use, not long-range precision. For home defense or range fun, it’s plenty accurate.
Can I attach a suppressor to this pistol?
Yes, the barrel is threaded (1/2×28) and compatible with most 5.56 suppressors. Keep in mind that adding a suppressor may require a longer handguard or adapter. Check local laws for suppressor ownership.
Does it come with any sights?
No, this pistol is sold without sights. It is optic-ready, so you can mount your own red dot, holographic, or magnified optic. We recommend a low-profile red dot for this compact setup.
Why Buy from Us
- ✅ Nationwide delivery to all 50 states
- ✅ Ships within 1-2 business days
- ✅ 30-day return policy
- ✅ Secure checkout with encrypted payment
Explore more AR pistols or check out our firearms collection. Last updated: April 2026. According to a 2025 industry survey, compact AR pistols now account for over 18% of new AR platform sales—shooters love the portability.
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This Maxim Defense PDX 505-SPS 5.56 NATO 5.50-inch Pistol 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.
Why Choose the Maxim Defense PDX 505-SPS 5.56 NATO 5.50-inch Pistol?
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