The Maxim Defense MDX 508-SBR 5.56 NATO 8.5" Barrel 30rd Urban Grey MXM-48103 is a premium short-barreled rifle designed for operators and serious shooters who demand maximum performance in a compact package. This MDX 508-SBR features an 8.5-inch barrel chambered in 5.56 NATO, the MD-CQB stock, an upgraded ALG trigger, the MDX Two-Piece Handguard, and the highly effective Hate Brake flash hider. Finished in a modern Urban Grey color, this SBR delivers exceptional maneuverability, reliability, and tactical functionality.
Why Choose the Maxim Defense MDX 508-SBR 5.56 NATO?
The Maxim Defense MDX 508-SBR is engineered for those who need a highly compact 5.56 NATO rifle without compromising on features or performance. The 8.5-inch barrel provides excellent ballistic performance while keeping the overall length extremely short and maneuverable. The MD-CQB stock offers a compact collapsed length with a stable shooting platform when extended. The ALG trigger delivers a crisp, consistent pull that significantly improves accuracy and follow-up shot speed. Combined with the MDX Two-Piece Handguard and Hate Brake flash hider, this SBR provides outstanding ergonomics and control. The Urban Grey finish gives the rifle a modern, tactical appearance that stands out from traditional black firearms.
Key Features of the Maxim Defense MDX 508-SBR 5.56
- 8.5-Inch Barrel – Compact barrel length optimized for 5.56 NATO performance and reliability
- 5.56 NATO Chambering – Versatile and widely available caliber with proven terminal performance
- MD-CQB Stock – Compact and stable stock designed for close-quarters maneuverability
- ALG Trigger – Premium trigger upgrade for a crisp break and short reset
- MDX Two-Piece Handguard – Lightweight, modular handguard with extensive M-LOK mounting options
- Hate Brake Flash Hider – Highly effective muzzle device that reduces flash and manages recoil
- Urban Grey Finish – Modern earth-tone finish with a tactical, low-visibility appearance
- 30-Round Capacity – Compatible with standard AR-15 magazines
Performance and Build Quality
The Maxim Defense MDX 508-SBR is built to the highest standards using premium components throughout. The 8.5-inch barrel is paired with a gas system specifically tuned for reliable cycling with 5.56 NATO ammunition. The MD-CQB stock provides a compact collapsed length while maintaining a solid cheek weld when extended. The ALG trigger significantly enhances shootability by delivering a clean, consistent pull that allows for faster and more precise follow-up shots. The MDX Two-Piece Handguard offers a strong, lightweight platform for mounting optics, lights, and other accessories. The Hate Brake flash hider dramatically reduces visible muzzle flash and helps control recoil during rapid fire. The Urban Grey finish provides a modern, non-reflective surface that blends well in various operational environments. This SBR reflects Maxim Defense’s commitment to producing compact, high-performance firearms that meet the demanding needs of professional users and serious enthusiasts.
Technical Specifications
| Product Name | Maxim Defense MDX 508-SBR |
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| Model Number | MXM-48103 |
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| UPC | 680017481032 |
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| Caliber | 5.56 NATO / .223 Remington |
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| Barrel Length | 8.5 inches |
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| Capacity | 30 Rounds |
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| Stock | MD-CQB Stock |
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| Trigger | ALG Trigger |
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| Handguard | MDX Two-Piece Handguard |
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| Muzzle Device | Hate Brake Flash Hider |
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| Finish | Urban Grey |
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| Product Type | Short-Barreled Rifle (SBR) |
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| Key Feature | 8.5" 5.56 SBR with MD-CQB Stock, ALG Trigger & MDX Handguard |
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| Best For | Close-Quarters Battle, Tactical Operations, Home Defense, Compact Rifle Use |
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Compact performance with premium components.
The Maxim Defense MDX 508-SBR 5.56 NATO delivers exceptional maneuverability and reliability in a highly compact short-barreled rifle with an Urban Grey finish.
Important Notice: This product is a short-barreled rifle (SBR) and is regulated under the National Firearms Act (NFA). It is the buyer’s responsibility to ensure compliance with all applicable federal, state, and local laws, including proper NFA registration, tax stamp requirements, and any additional state restrictions. This product is intended for lawful use only by individuals legally allowed to possess NFA firearms. Always follow proper firearm safety rules. Keep out of reach of children.
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