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The paper is focused on the establishment of a mathematical model describing the motion of bolt carrier for the amphibious rifles when shooting underwater in the period of the projectile moving to the position of the gas port. Besides, the conditions for bolt carrier motion are studied. The object of this paper is the bolt carrier assembly of the 5.56 mm amphibious rifle according to the designing of the research project of the ministry of defense 2017.73.034. The result of this research indicates that: for the 5.56 mm amphibious rifle, the bolt carrier is only moving when the velocity of the projectile at the position of the gas vent is larger 360.25 m/s. The result of this research can be applied to the dynamic analysis of the automatic mechanism of gas-operated rifles when shooting underwater. | The analysis of the motion of bolt carrier for the amphibious rifles when shooting underwater in the initial period
