Lancer L5AWM .300 Blackout 20-Round Opaque Black Magazine
The Lancer Systems L5AWM .300 Blackout 20-Round Magazine (L5BO-G2-20-BLK) combines Lancer's hybrid steel-and-polymer magazine construction with an internal geometry specifically developed for heavy .300 AAC Blackout ammunition. This opaque black magazine features a durable polymer body, one-piece wraparound steel feed lip assembly, prominent .300 Blackout identification markings, and a contrasting Flat Dark Earth (FDE) floorplate.
Designed primarily for heavy subsonic .300 BLK cartridges, particularly those loaded with projectiles weighing 200 grains or more, the L5AWM offers a dedicated magazine option for shooters who want a clearly identified ammunition platform and a compact 20-round capacity.
Optimized for Heavy Subsonic .300 Blackout Ammunition
The .300 AAC Blackout cartridge is available in a broad range of bullet weights and projectile profiles. Longer, heavier subsonic bullets can create cartridge-stacking and feeding challenges in conventional .223 Remington and 5.56 NATO magazines.
Lancer addresses those differences with updated internal magazine geometry designed to accommodate heavy .300 Blackout cartridges more effectively. This dedicated configuration is particularly relevant to loads featuring 200-grain and heavier bullets.
Manufacturer recommendation: For lightweight supersonic .300 Blackout ammunition weighing less than 150 grains, Lancer recommends using its standard .223/5.56 L5AWM magazine instead.
Hybrid Steel Feed Lips and Polymer Body
The L5AWM magazine combines a lightweight polymer body with a one-piece, wraparound steel feed lip assembly. Steel reinforcement at the feed lips provides durability at an important contact point, while the polymer body keeps the magazine lightweight and resistant to everyday handling.
An aggressive exterior surface texture provides additional grip during handling and magazine changes. This steel-and-polymer construction is a defining feature of the L5 Advanced Warfighter Magazine family.
Opaque Black Body with Contrasting FDE Floorplate
This model features an opaque black body with molded .300 Blackout markings and a contrasting Flat Dark Earth floorplate. The combination provides a distinctive appearance and makes the dedicated .300 BLK magazine easier to differentiate from otherwise similar AR-pattern magazines.
Clearly identifying ammunition and magazine caliber is especially important for shooters who own firearms chambered in both .300 Blackout and 5.56 NATO. Never rely on magazine color alone to confirm cartridge compatibility.
Compact 20-Round Magazine Configuration
The 20-round capacity provides an alternative to longer 30-round magazines while maintaining Lancer's dedicated .300 Blackout cartridge geometry. This configuration is suitable for compatible AR-pattern firearms that accept the L5AWM magazine platform.
Magazine fit, ammunition feeding, and last-round bolt hold-open depend on the individual firearm and ammunition combination.
American-Made Lancer Systems Magazine
Lancer states that its L5AWM magazines are designed, tooled, manufactured, and assembled in the United States. The L5AWM .300 Blackout 20-round magazine delivers the company's hybrid magazine construction in a cartridge-specific configuration.
Manufacturer part number L5BO-G2-20-BLK. UPC 738435622619. Includes one 20-round magazine; ammunition is not included.
Popular Pairings & Related Products
Pair the Lancer L5AWM .300 Blackout 20-round magazine with heavy subsonic ammunition designed for compatible .300 AAC Blackout firearms.