The U.S. military, it’s allies and law enforcement officers stake their lives on their firearms. A poorly manufactured magazine could be deadly. That's why they rely on magazines made by Thermold Design and Development. Unlike metal magazines, Thermold products won’t jam because they’re made with a nylon that resists heat, dirt and rust.Abuse them, drop them, throw them in the mud. Our magazines are dent resistant, non-corrosive, and self-lubricating. Thermold products endure.