The Gas Buster® charging handle with Big Military latch is a safety device with ergonomic design that diverts harmful gases, oil and dirt particles away from the shooter. This is a PRi Patented product. Safety approved & used by the US Marine corps. This product doesn't work as well with left hand shooters because of the gas porting properties. The charging handle is constructed of T6 7075 hard coat black anodized aluminum with a steel latch.