Abstract: A bolt carrier gas impingement system is provided. The bolt carrier gas impingement system may include a bolt carrier assembly including a bolt carrier and a bolt; a gas key having a gas passageway; a gas tube configured for routing gas from a discharged round to a gas key tube and the gas passageway of the gas key; and a bypass duct formed in the bolt carrier, wherein the bypass duct may be configured to provide a duct between the gas passageway and an exterior of the bolt carrier assembly, such that the discharged gas flows out of the bypass duct without contacting internal components of the bolt carrier assembly.