Classic 20 Round AR15/M16 Magazine Design New production 20 Round straight body aluminum magazines feature the reliability you've come to expect from Brownells USGI type mags. The original 20 round profile is retained, with improved geometry at the feed lips and at the bolt catch interface, to ensure the most reliable magazine possible. New laser welded halves remove any potential for spot welds to deform magazine body, ensuring a smooth ammo stack and exterior profile. Stamped aluminum two half construction Laser welded seems Matte gray anodizing Dry film application to ensure smooth operation Re-profiled feed lips for improved performance B Mfg: Brownells