Maxim Defense SDX 508 SBR — .300 AAC Blackout 8.5 in

The Maxim Defense SDX 508 is a compact short-barreled rifle chambered in .300 AAC Blackout with an 8.5-inch barrel and a Flat Dark Earth finish. This semi-automatic SBR carries a 30-round capacity and features a polymer grip for consistent handling. Its compact configuration is suitable for applications where a shorter overall length and maneuverability are priorities.

Key Specifications

• Chambered in .300 AAC Blackout.
• The barrel measures 8.5 inches.
• This is a Semi-Auto action.
• Equipped with a 30-round capacity.
• Finished in Flat Dark Earth.
• Features a Polymer grip material.
• Model designation is SDX.
• Configured as a Short-Barreled Rifle (SBR).

Purpose-built for users who need a compact, hard-working platform, the SDX 508 delivers a balance of reduced overall length and full-powered cartridge performance. Its semi-automatic operation, substantial magazine capacity, and durable finish make it a practical choice for those seeking a compact AR-platform rifle for close-quarters and compact-platform applications.