The Lancer L5AWM 300 Blackout 30 Round Magazine is a dedicated .300 AAC Blackout / 300 BLK AR-15 magazine with a translucent smoke polymer body and hardened steel feed lips. This model, 999-000-4280-01, gives shooters a 30-round capacity magazine built specifically for AR-15 rifles chambered in 300 Blackout.

Lancer’s L5 Advanced Warfighter Magazine design combines a lightweight polymer magazine body with a one-piece steel feed lip assembly. The result is a hybrid magazine that offers the impact resistance and weight savings of polymer with the feed lip strength and durability of steel.

Dedicated 300 Blackout Magazine: While some 5.56 NATO magazines may feed some 300 Blackout loads, dedicated 300 BLK magazines are preferred for many builds, especially when using heavier bullets, subsonic ammunition, or longer projectile profiles. This Lancer 300 Blackout magazine is designed around the cartridge geometry of .300 AAC Blackout rather than being a generic 5.56 magazine.

Translucent Smoke Body: The translucent smoke magazine body lets the shooter quickly estimate remaining rounds while maintaining a dark, low-profile appearance. This is especially useful for distinguishing 300 Blackout magazines from standard 5.56 NATO magazines.

AR-15 Platform Fitment: This magazine is designed for compatible AR-15 pattern rifles and pistols chambered in .300 AAC Blackout. Always confirm firearm, caliber, magazine well, ammunition, and state/local magazine capacity restrictions before purchase or use.

Important Safety Note: Because 300 Blackout and 5.56 NATO cartridges can be present in similar AR-15 platforms, clearly marking and separating magazines by caliber is strongly recommended. Never chamber or fire ammunition unless the firearm, barrel, magazine, and cartridge are correctly matched.

Related Gear: Browse more magazines, shop the AR-15 Store, view compatible centerfire rifle ammunition, or compare the Lancer L5AWM 300 Blackout 20 Round Magazine.