Patent attributes
The present invention relates to a cartridge casing for firearm ammunition and to a method of manufacturing such casing. The casing (1) comprises an elongate interior cavity (4) and extends along a longitudinal axis (5). The cavity (4) is open at the top end of the casing (1) and is defined radially by a circumferentially extending sidewall (3) formed by an elongate tubular portion and at the bottom by a bottom wall (2) which is connected to an axial end of the tubular portion and comprises a bore (7). The casing (1) further comprises in a lateral outer surface an annular projection (18) located proximate the bottom end of the casing (1) and extending circumferentially in a plane perpendicular to the longitudinal axis (5) of the casing (1). The casing (1) comprises an elongate tubular sleeve component (10) open at both axial ends and a separate bottom component (11) fixedly secured to the sleeve component (10). The tubular portion is formed by the sleeve component (10), and the bottom wall (2) is formed at least in part by the bottom component (11). The bottom component (11) comprises a lower axial end surface (8), an opposite upper axial end surface (15) and a circumferentially extending lateral outer surface on which the annular projection (18) is arranged. The casing (1) may be manufactured by providing the bottom component (11) and the sleeve component (10) and fixedly securing the sleeve component (10) to the bottom component (11).
