The Maxim Defense MAXIM MDX 516 5.56 16″ 30RD Black is a semi-automatic modern sporting rifle built for shooters who want a reliable, modular platform for range work and general-purpose use. Chambered in .223 REM/5.56 NATO with a 16” barrel and 30-round capacity, this rifle combines a compact M-LOK handguard with a durable black finish for a no-nonsense look. The MDX 516 is ready to handle everything from target practice to home defense training, offering the handling and adaptability that informed shooters value.
| Specification | Detail |
|---|---|
| Manufacturer | Maxim Defense Industries |
| Model | MAXIM MDX 516 |
| Material | 7075-T6 aluminum receiver, steel barrel (per manufacturer specs) |
| Compatibility | Standard AR-15 lower parts, M-LOK accessories |
| Finish | Black anodized |
| Weight | 6.5 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 16” Barrel with Mid-Length Gas System – Why it matters: The mid-length gas system reduces recoil impulse and improves reliability compared to carbine-length systems, making it easier for newer shooters to stay on target during rapid fire.
- M-LOK Compatible Free-Float Handguard – Why it matters: You can attach lights, grips, or bipods directly to the handguard without tools, keeping your rifle setup exactly how you need it for different shooting tasks.
- Adjustable Stock with Compact Design – Why it matters: The stock adjusts for length of pull, so smaller shooters or those wearing heavy gear can find a natural, comfortable shooting position.
- Flat-Faced Trigger – Why it matters: A flat face provides a consistent finger placement, which helps reduce trigger pull variation and improves accuracy for shooters of all skill levels.
- Black Anodized Finish – Why it matters: This finish resists corrosion and wear, keeping your rifle looking good even after years of use in varied weather conditions.
Who It’s For
The Maxim Defense MAXIM MDX 516 is built for families and new shooters who want a rifle that grows with their skills. If you’re teaching a teenager to shoot or adding a reliable AR to your home defense plan, this rifle’s balanced handling and modular design make it a smart choice. It’s also ideal for experienced shooters who appreciate a ready-to-run platform without extra bells and whistles.
Pros & Cons
- Pros: Reliable gas system, easy to customize with M-LOK, adjustable stock fits multiple shooters, flat trigger aids accuracy.
- Cons: The black finish shows dust and fingerprints more than some coatings, but it’s easy to clean with a microfiber cloth.
Comparison
| Feature | Maxim Defense MDX 516 | Zev Technologies OZ-9 | Geissele Super Duty |
|---|---|---|---|
| Caliber | .223 REM/5.56 NATO | 9mm | .223 REM/5.56 NATO |
| Barrel Length | 16” | 5.1” (pistol) | 16” |
| Gas System | Mid-length | N/A (blowback) | Mid-length |
| Handguard | M-LOK free-float | Proprietary | M-LOK free-float |
| Weight (unloaded) | 6.5 lbs | 1.9 lbs | 6.4 lbs |
| Price | $2,425.50 | $1,200 | $1,800 |
Compared to the Zev OZ-9, the MDX 516 offers a rifle-length platform better suited for longer-range shooting. Against the Geissele Super Duty, the MDX 516 provides a more budget-friendly entry point with similar build quality and M-LOK compatibility.
FAQ
What is the barrel twist rate on the Maxim Defense MAXIM MDX 516?
The barrel has a 1:7 twist rate, which stabilizes heavier bullets (55-77 grain) commonly used in 5.56 NATO loads, making it versatile for both target and defensive ammunition.
Is the Maxim Defense MAXIM MDX 516 California compliant?
This model ships with a standard 30-round magazine and features that may not meet California compliance requirements. Please check your local laws before ordering.
Can I mount a suppressor on the MDX 516?
Yes, the barrel is threaded 1/2×28 TPI, so you can attach a suppressor or muzzle device. The mid-length gas system also helps reduce gas blowback when using a can.
What type of warranty does Maxim Defense offer?
Maxim Defense provides a limited lifetime warranty on the receiver and a one-year warranty on other components. Contact their customer service for full details.
Ready to Order?
The Maxim Defense MAXIM MDX 516 5.56 16″ 30RD Black is in stock and ready to ship. Whether you’re teaching a new shooter or upgrading your own setup, this rifle delivers reliable performance at a fair price.
✔ Nationwide delivery (all 50 states)
✔ Ships 1-2 business days
✔ 30-day returns
✔ Secure checkout
Last updated: April 2026
Buy Firearms Online – Reliable & Affordable
This Maxim Defense MAXIM MDX 516 5.56 16″ 30RD Black 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 MAXIM MDX 516 5.56 16″ 30RD Black?
- ✅ Quality guaranteed by top firearm manufacturers
- ✅ Ships fast across the USA
- ✅ Legal compliance and background-check ready
Buy Firearms Near Me – Nationwide Delivery
No matter your location, we ship to all 50 states. Looking for where to buy Accessories near you? FRT-15.com brings the best selection to your door, legally and securely.
Shipping & Return Policy
- 📦 Fast shipping within 1–3 business days
- 🔁 30-day return policy for unused, unmodified items
- 💬 Questions? Contact our support team
Related Firearms
Explore more options: handguns, rifles, shotguns, and trigger kits.
Reviews
There are no reviews yet.