The MAXIM DEFENSE MDX 510 C SBR .300 BLK 10.3" is a compact, high-performance short-barreled rifle chambered in .300 Blackout. Built by Maxim Defense Industries, this premium SBR (model MXM-48122) features a 10.3-inch barrel, a grey Cerakote finish, and the innovative MDX two-piece handguard system. Equipped with Maxim’s signature Hate Brake flash hider, this rifle delivers exceptional maneuverability, suppressed performance, and reliability in a compact package ideal for close-quarters work, vehicle operations, and home defense.
Why Choose the Maxim Defense MDX 510 C SBR?
The Maxim Defense MDX 510 C SBR stands out in the crowded .300 Blackout market thanks to its thoughtful engineering and premium components. The 10.3-inch barrel provides an excellent balance between ballistic performance and overall length, making it highly maneuverable without sacrificing too much velocity. The MDX two-piece handguard offers exceptional rigidity while allowing easy access for maintenance. Combined with the Hate Brake flash hider, this SBR is optimized for both suppressed and unsuppressed use. Whether you’re a professional operator, competitive shooter, or serious enthusiast looking for a high-quality factory SBR, the MXM-48122 delivers professional-grade performance right out of the box.
Key Features of the Maxim Defense MDX 510 C SBR
- 10.3-Inch Barrel – Optimized length for .300 Blackout with excellent terminal performance
- .300 Blackout Chambering – Superior suppressed performance and versatility with subsonic and supersonic ammunition
- MDX Two-Piece Handguard – Rigid, lightweight, and easy to maintain modular handguard system
- Hate Brake Flash Hider – Maxim Defense’s proprietary flash hider significantly reduces muzzle flash
- Grey Cerakote Finish – Durable, corrosion-resistant grey finish for enhanced protection and aesthetics
- 30-Round Magazine Capacity – Ships with a 30-round magazine for maximum firepower
- Short-Barreled Rifle Configuration – Compact overall length for superior handling in confined spaces
- Model MXM-48122 – Official Maxim Defense part number with UPC 680017481223
Performance and Build Quality
The MAXIM DEFENSE MDX 510 C SBR is built to the highest standards using premium materials and manufacturing processes. The 10.3-inch barrel is precision machined and paired with a high-quality gas system tuned specifically for reliable function with both supersonic and subsonic .300 Blackout ammunition. The MDX two-piece handguard provides a rock-solid mounting platform for optics, lights, and other accessories while maintaining a slim profile. The included Hate Brake flash hider dramatically reduces visible muzzle signature, making it an excellent choice for low-light operations or when paired with a suppressor. The grey Cerakote finish offers outstanding resistance to abrasion, chemicals, and corrosion. Every component is carefully selected and assembled to deliver consistent reliability and accuracy in a compact, hard-hitting package.
Technical Specifications
| Product Name | Maxim Defense MDX 510 C SBR |
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| Model Number | MXM-48122 |
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| UPC | 680017481223 |
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| Caliber | .300 Blackout |
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| Barrel Length | 10.3 Inches |
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| Overall Length | Approximately 26.5 Inches (varies with stock) |
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| Capacity | 30 Rounds |
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| Handguard | MDX Two-Piece Handguard |
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| Muzzle Device | Hate Brake Flash Hider |
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| Finish | Grey Cerakote |
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| Best For | Close Quarters, Suppressed Use, Home Defense, Vehicle Operations |
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Experience premium compact performance in .300 Blackout.
The Maxim Defense MDX 510 C SBR combines innovative design with proven reliability.
Important Notice: This product is a short-barreled rifle (SBR) and is regulated under the National Firearms Act (NFA). It is subject to all applicable federal, state, and local laws. Possession of this firearm requires proper ATF registration and tax stamp. It is the buyer’s responsibility to know and comply with all applicable laws regarding the purchase, possession, and transfer of NFA firearms. 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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