The MAXIM DEFENSE SDX 510 C SBR .300 BLK 10.3" is a premium, factory-suppressed short-barreled rifle chambered in .300 Blackout. This complete system (model MXM-48231) features a 10.3-inch barrel finished in classic black, an ALG trigger, a two-piece handguard, and comes equipped with the DSX D 7.62 suppressor. Built by Maxim Defense Industries, this SBR delivers exceptional suppressed performance, reliability, and maneuverability in a compact package optimized for close-quarters battle, tactical operations, and professional use.
Why Choose the Maxim Defense SDX 510 C SBR in .300 Blackout?
The Maxim Defense SDX 510 C SBR in .300 Blackout is a complete, ready-to-deploy suppressed rifle system. Unlike traditional builds that require separate suppressor purchases and additional paperwork, this model comes factory-equipped with the DSX D 7.62 suppressor, providing an optimized gas system and superior sound suppression right out of the box. The .300 Blackout caliber excels in suppressed applications, offering excellent terminal ballistics with both supersonic and subsonic ammunition. The classic black finish provides a professional, low-visibility appearance that performs well in a wide range of environments. Combined with the ALG trigger and two-piece handguard, this SBR is engineered for professionals who demand maximum performance in a compact, suppressed package.
Key Features of the Maxim Defense SDX 510 C SBR .300 BLK
- 10.3-Inch Barrel – Compact barrel length optimized for close-quarters maneuverability and .300 Blackout performance
- .300 Blackout Chambering – Superior suppressed performance with excellent terminal ballistics using subsonic and supersonic ammunition
- DSX D 7.62 Suppressor – Factory-included suppressor optimized for the SDX platform for superior sound reduction
- Black Finish – Durable, professional black coating with excellent corrosion resistance
- ALG Trigger – High-performance trigger upgrade delivering a crisp, clean, and consistent pull
- Two-Piece Handguard – Rigid and modular handguard system for easy accessory mounting and maintenance
- 30-Round Magazine Capacity – High-capacity magazine for maximum firepower
- Model MXM-48231 – Official Maxim Defense part number with UPC 680017482312
Performance and Build Quality
The MAXIM DEFENSE SDX 510 C SBR .300 BLK 10.3" BLACK is built to the highest standards using premium components and precision manufacturing. The 10.3-inch barrel is paired with a gas system specifically tuned for reliable suppressed function with the included DSX D 7.62 suppressor. The .300 Blackout caliber paired with a quality suppressor provides exceptional sound reduction and minimal muzzle flash, making it ideal for tactical and home defense applications. The ALG trigger provides a smooth, predictable break that enhances accuracy during both slow-fire and rapid engagements. The two-piece handguard offers a rock-solid mounting platform for optics, lights, and other accessories. The black finish delivers outstanding protection against harsh environmental conditions while giving the rifle a professional, tactical appearance. This complete SBR system is designed to deliver consistent, reliable performance in demanding tactical environments.
Technical Specifications
| Product Name | Maxim Defense SDX 510 C SBR .300 BLK |
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| Model Number | MXM-48231 |
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| UPC | 680017482312 |
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| Caliber | .300 Blackout |
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| Barrel Length | 10.3 Inches |
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| Capacity | 30 Rounds |
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| Suppressor | DSX D 7.62 Suppressor (Included) |
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| Trigger | ALG Trigger |
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| Handguard | Two-Piece Handguard |
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| Finish | Black |
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| Configuration | Short-Barreled Rifle (SBR) |
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| Best For | Close Quarters, Suppressed Operations, Tactical Use, Home Defense |
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Experience complete suppressed performance in .300 Blackout.
The Maxim Defense SDX 510 C SBR comes ready to deploy with factory suppressor and premium upgrades.
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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