RIFLE: BUSHMASTER FIREARMS MODEL CARBON-15, SERIAL NUMBER E26877, BLACK (MATTE), CASE NOT INCLUDED, SEMI - AUTOMATIC, 5.56 NATO, 16 Notes: Bushmaster Firearms Carbon-15 5.56 NATO Description: Type: Semi-automatic rifle chambered in 5.56 NATO. Size: Lightweight AR-platform design with dimensions varying by model configuration. Capacity: Magazine capacity varies by configuration and applicable regulations. Features: Carbon-fiber-reinforced polymer construction, lightweight receiver design, AR-style operating platform, and modular components. Weight: Varies depending on barrel length and model configuration. Design: Lightweight rifle platform designed with an emphasis on reduced overall weight and a durable, streamlined construction. Summary: The Bushmaster Carbon-15 5.56 NATO is a lightweight semi-automatic rifle featuring a polymer-based construction and AR-platform design. Its reduced-weight configuration and familiar platform distinguish it from traditional aluminum-receiver rifles.