This completely assembled, ready to install M16 bolt and carrier system from FailZero features critical parts that have been treated with EXO technology. EXO is a revolutionary surface treatment that provides a permanent dry lubricity to parts, which radically improves the performance the AR-15 platform. EXO essentially eliminates the need to apply oil or grease to treated parts for the life of the weapon. The bolt, extractor, firing pin, cam pin, bolt carrier, and carrier key have all been treated.
