This is a Lancer L5AWM 30-round magazine for AR-15 rifles in .223 Remington/5.56x45mm

Lancer’s Advanced Warfighter Magazines combine the best of both worlds for the ultimate hybrid rifle magazine. Perfect for civilians, law enforcement and military alike, L5AWM deliver innovative features, improved internal geometry, and an in-house design that takes performance & reliability to the next level.

Designed & manufactured in the United States of America, Lancer L5AWM magazines are some of the most popular aftermarket AR-15 mags available today, and they’re compatible with most platforms (including the SCAR 16, SIG MCX and ARX160).