SureFire M4/M16/AR-15 High-Capacity Magazine - 5.56x45mm (.223 Remington), 100 Round, Black
The SureFire high-capacity magazine for 5.56x45 mm (.223 Remington) ammunition, 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. 
Description:
Compatible with all weapons that accept standard STANAG 4179 compliant magazines
Reliable functioning due to mechanical simplicity and high-quality non-binding coil spring—no lubricants required
Long-lasting springs are cadmium coated for low friction and excellent corrosion resistance.