This AR-10 LR-308 firing pin replacement is chrome plated and is a high-quality 4140 steel replacement firing pin for your AR 308 rifle. It has a hard chrome finish to increase LR-308 firing pin longevity and make cleaning easier. The firing pin measures Length: 3.95". This firing pin made from chrome plated 4140 alloy steel that is is considerably stronger than a standard steel. This firing pin is designed to drop in to any mil-spec bolt carrier group .308 caliber AR-style rifles or pistols. This AR-10 LR308 platform firing pin is made in the USA.