Ultra-high capacity magazines keep your rifle running longer between mag changes during competition or tactical operations. These magazines meet NATO STANAG 4179 specifications and are compatible with all rifles that accept AR-15/M16/M4 magazines. Less than two standard magazines wide, so they’re easy to hold and handle with one hand. 60-round model fits most dual-mag pouches for 30-round magazines. Weight is centered under the weapon to help you maintain a normal shooting grip and stance. Seats fully loaded on a closed bolt. "Nesting" nylon followers require no lubrication and fully support the round stack to aid in reliable feeding. Cadmium coating on springs reduces f Mfg: Surefire SPECS: Aluminum body, hardcoat anodized, matte gray finish. Nylon followers. Cadmium-coated springs. 60-Rd 8.7" (22.1cm) tall, 1.66" (4.2cm) wide at base. 6.4 oz. (181g) wt. empty, 2 lbs. (907g) wt. fully loaded.