Length: 8.70 inches - Width: 1.66 inches - Weight Empty: 6.4 ounces - Weight Loaded: 2.02 pounds - The SureFire high-capacity magazine for 5.56x45 mm (.223 Remington) ammunition also available in a 100-round version is compatible with M4/M16/AR-15 variants and other firearms that accept standard STANAG 4179 magazines. Constructed from Mil-Spec hard-anodized aluminum they feed smoothly and reliably due to optimal geometry non-binding coil springs and ingenious nesting polymer followers. The long-lasting springs are cadmium coated for low friction and excellent corrosion resistance. Magazines require no lubricants and can be easily disassembled without tools for cleaning. - SureFire High-Capacity magazines provide distinct tactical advantages: increased initial firepower in ambush situations; fewer reloads overall which means less downtime and target distraction in a firefight; fast and easy magazine insertion even with a closed bolt; less bulk compared to drum mags enabling a normal weapon grip. The 60-round magazine