PISTOL: DIAMONDBACK FIREARMS MODEL DBX57 IMPORTED BY DIAMONDBACK FIREARMS, LLC, SERIAL NUMBER DBX0021, SEMI - AUTOMATIC, 5.7X28MM, BLACK (MATTE), YES - INCLUDES ORIGINAL BOX, 8 Notes: Diamondback Firearms DBX57 Description: Type: Semi-automatic pistol chambered in 5.7x28mm. Size: Compact firearm based on a gas-operated design, with dimensions varying by configuration. Capacity: Uses FN P90/PS90-pattern 5.7x28mm magazines. Features: Gas-operated action, ambidextrous controls, M-LOK-compatible handguard, and an optics-ready configuration. Weight: Approximately 4 lb., depending on configuration. Design: Compact, modern platform combining a 5.7x28mm chambering with a lightweight design and modular accessory interfaces. Summary: The Diamondback Firearms DBX57 is a compact 5.7x28mm semi-automatic firearm featuring a gas-operated action and modular design. Its compatibility with P90/PS90-pattern magazines and modern accessory interfaces distinguish it within the 5.7x28mm category.