The MAXIM DEFENSE SDX 505 SUPPRESSED SBR 5.56 NATO 5.5" is a complete, factory-built suppressed short-barreled rifle designed for maximum performance in close-quarters and tactical environments. This premium system (model MXM-48240) features a 5.5-inch barrel, an Arid Cerakote finish, the MD-CQB stock, an ALG trigger, the SDX two-piece handguard, and comes equipped with the DSX:D 5.56 suppressor. Built by Maxim Defense Industries, this SBR offers exceptional suppressed performance, reliability, and maneuverability in one ready-to-deploy package.
Why Choose the Maxim Defense SDX 505 Suppressed SBR?
The Maxim Defense SDX 505 Suppressed SBR is a fully integrated suppressed rifle system that eliminates the need for separate suppressor purchases and additional NFA paperwork. This model comes factory-equipped with the DSX:D 5.56 suppressor, which is specifically tuned to the SDX 505 platform for optimal sound reduction and gas management. The ultra-compact 5.5-inch barrel combined with the Arid Cerakote finish makes this rifle ideal for arid and desert environments. With the inclusion of the ALG trigger and MD-CQB stock, the SDX 505 delivers professional-grade accuracy and control in an extremely compact package.
Key Features of the Maxim Defense SDX 505 Suppressed SBR
- 5.5-Inch Barrel – Ultra-compact barrel length for maximum maneuverability in confined spaces
- 5.56 NATO Chambering – Versatile and widely available caliber with excellent terminal ballistics
- DSX:D 5.56 Suppressor – Factory-installed suppressor optimized for the SDX 505 platform
- Arid Cerakote Finish – Premium ceramic coating offering excellent corrosion resistance and a tactical desert appearance
- ALG Trigger – High-performance trigger upgrade delivering a crisp, clean, and consistent pull
- MD-CQB Stock – Purpose-built stock designed for enhanced stability and control
- SDX Two-Piece Handguard – Rigid, modular handguard system for easy accessory mounting
- 30-Round Magazine Capacity – High-capacity magazine for maximum firepower
- Model MXM-48240 – Official Maxim Defense part number with UPC 680017482404
Performance and Build Quality
The MAXIM DEFENSE SDX 505 SUPPRESSED SBR 5.56 NATO 5.5" ARID is engineered for professional use in demanding environments. The 5.5-inch barrel paired with the DSX:D 5.56 suppressor provides exceptional sound suppression while maintaining reliable function. The gas system has been carefully tuned to work seamlessly with the included suppressor, reducing back pressure and improving overall shootability. The ALG trigger offers a smooth, predictable break that enhances accuracy during rapid engagements. The MD-CQB stock provides a stable shooting platform, while the SDX two-piece handguard allows for easy mounting of optics, lights, and other accessories. The Arid Cerakote finish ensures long-term durability and protection against harsh environmental conditions.
Technical Specifications
| Product Name | Maxim Defense SDX 505 Suppressed SBR |
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| Model Number | MXM-48240 |
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| UPC | 680017482404 |
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| Caliber | 5.56 NATO |
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| Barrel Length | 5.5 Inches |
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| Capacity | 30 Rounds |
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| Suppressor | DSX:D 5.56 Suppressor (Included) |
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| Trigger | ALG Trigger |
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| Stock | MD-CQB Stock |
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| Handguard | SDX Two-Piece Handguard |
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| Finish | Arid Cerakote |
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| Configuration | Short-Barreled Rifle (SBR) |
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| Best For | Close Quarters Battle, Suppressed Operations, Tactical Use |
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Experience ultimate suppressed performance in an ultra-compact package.
The Maxim Defense SDX 505 Suppressed SBR comes fully equipped and ready for deployment.
Important Notice: This product is a short-barreled rifle (SBR) and includes a suppressor. Both are regulated under the National Firearms Act (NFA). Possession requires proper ATF registration, tax stamps, and compliance with all applicable federal, state, and local laws. It is the buyer’s responsibility to know and comply with all applicable laws regarding the purchase, possession, and transfer of NFA firearms and suppressors. Must be 18 years or older (or 21 in some jurisdictions) to purchase. Keep out of reach of children. This product is intended for lawful use only.
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