Engineered specifically for heavy subsonic .300 Blackout ammo (200+ grain), the L5AWM 300BLK delivers the reliable feeding you need when traditional 5.56 mags fall short. With redesigned internal geometry, this mag ensures proper cartridge stacking, eliminating common feeding issues associated with long, heavy rounds. Externally, it's easy to identify with distinct .300 BLK markings and a Flat Dark Earth (FDE) floor plate, helping you instantly separate it from your 5.56 mags. Note: For lighter supersonic .300 BLK (<150gr), Lancer recommends using standard L5AWM 5.56 magazines. Key Features: Optimized internal geometry for reliable feeding of 200+ grain subsonic .300 Blackout Distinctive .300 BLK markings for easy identification Flat Dark Earth (FDE) floor plate for visual contrast in mixed mag setups One-piece wrap-around steel feed lips for unmatched strength and durability Durable polymer body resists impact, heat, and harsh environments Compatible with AR15/M4 platforms and other 5.56-based systems Proudly made in the USA Built tough. Feeds smooth. Identifies fast. The Lancer L5AWM 300BLK is your go-to mag for reliable subsonic .300 Blackout performance.