Patent ID: 8253085
Filing Date: 2012-08-28
Classification: F42B

Abstract:
1. A projectile, comprising: a body; a base fixed to a rear end of the body, the base including a gas cavity and an opening extending from a rear end of the base to the gas cavity; a retention plug disposed in the opening wherein a fit between the retention plug and the opening is such that propellant gas pressure in the gas cavity forces the retention plug out of the opening, the retention plug including at least one gas conduit between an outer surface of the retention plug and the gas cavity; and a plurality of fins rotatably fixed to the base, the fins having a folded position and a deployed position; and a retention screw adjustably disposed in a rear end of the retention plug and a tab disposed on an inner edge of each fin, wherein the retention screw bears against the tabs to maintain the fins in the folded position.