A primer structure is provided for holding a deposited ignitable material, and for holding the ignitable material within a firearm cartridge or within another munition. The primer includes a disk and a retaining ring. Ignitable material is deposited on a surface of the disk. The retaining ring is positioned in front of the disk. The retaining ring includes angled passageways for reaction products to travel from the ignitable material to the propellant. The forwardmost surface of the retaining ring, as well as the angle of the passageways, dissipate pressure that would otherwise be borne by the disk. Both the disk and retaining ring include angled or stepped surfaces to resist movement under pressure.

A cartridge that generates higher than typical chamber pressures has an enhanced means of primer retention for retaining the primer in the primer recess of the casing. The means may be a lip folded onto a conical surface, a annular groove to receive deformed primer wall portion material upon detonation, a concavity in the rearward facing wall of the primer, a check valve in the flash tube to inhibit propellant gases from reaching the primer recess, or specifically configured primers with a greater length than diameter and with greater wall thicknesses.

Ammunition (100, 100) for light firearms, the ammunition (100, 100) defining a longitudinal axis (X) and comprising: a tubular casing (1, 1) containing gunpowder (2), provided with a base (3, 3) which delimits a hole (31, 3); a primer cartridge (4) which closes said hole (31, 3); at least one bullet (5) at least partially arranged in the casing (1, 1); a body (6), or base wad, made of polymeric material, defining a cavity (60), arranged in the casing (1, 1); wherein said body (6) comprises: a first part (61) having an outer surface in contact with the inner surface of the casing (1, 1); and a second part (62), spaced apart from the inner surface of the casing (1, 1), formed by a side wall (621) which extends from said first part (61), and by an upper wall (622), spaced apart from said first part (61), transverse to said side wall (621); characterized in that said side wall (621) is completely closed and comprises one or more portions (71, 72) adapted to break at the detonation of the primer cartridge (4, 4) so as to create a passageway (71a, 71b) at each of said one or more portions (71, 72); each portion (71, 72) of said one or more portions (71, 72) having a thickness, orthogonally to the longitudinal axis (X), which is less than the remaining part (7) of said side wall (621).

The present invention provides three piece primer insert for use in polymer ammunition comprising: an upper primer insert portion comprising an upper primer insert bottom portion, a substantially cylindrical coupling element extending away from the upper primer insert bottom portion; and an upper flash aperture that extends through the upper primer insert bottom portion, a lower primer insert portion in contact with the upper primer insert portion, wherein the lower primer insert portion comprises a lower primer insert top portion positioned adjacent to the upper primer insert bottom portion at a connection joint, a lower flash aperture positioned in the lower primer insert top portion and aligned with the upper flash aperture, and a primer recess that extends away from the lower primer insert top portion to an extraction flange and in communication with the lower flash aperture; and a connecting portion that secures the upper primer insert portion and the lower primer insert portion wherein the connecting portion comprises a connecting member positioned in the upper flash aperture and the lower flash aperture, an upper tab connected to the connecting member to extend away from the upper flash aperture into the upper primer insert portion, a lower tab connected to the connecting member to extend away from the lower flash aperture into the primer recess, and a flash hole that extends from the upper tab to the lower tab to connect the upper primer insert bottom portion to the primer recess.

The present invention provides an ammunition cartridge having a primer insert having a top surface opposite a bottom surface and a extraction flange that extends circumferentially about an outer edge of the top surface; a coupling element that extends from the bottom surface, wherein the substantially cylindrical coupling element is adapted to receive a polymer overmolding; a primer recess in the top surface that extends toward the bottom surface, wherein the primer recess comprises a recess bottom and a circular recess side wall; a primer flash aperture through the recess bottom that extends through the bottom surface, wherein the primer flash aperture is adapted to receive a polymer overmolding to form a flash hole; and one or more pads positioned on the recess bottom; a groove in the primer recess positioned around the primer flash aperture to extend at least partially over the recess bottom and adapted to receive a polymer overmolding.

The present invention provides an ammunition cartridge having a primer insert having a top surface opposite a bottom surface and a extraction flange that extends circumferentially about an outer edge of the top surface; a coupling element that extends from the bottom surface, wherein the substantially cylindrical coupling element is adapted to receive a polymer overmolding; a primer recess in the top surface that extends toward the bottom surface, wherein the primer recess comprises a recess bottom and a circular recess side wall; a primer flash aperture through the recess bottom that extends through the bottom surface, wherein the primer flash aperture is adapted to receive a polymer overmolding to form a flash hole; and a groove in the primer recess positioned around the primer flash aperture adapted to receive a polymer overmolding, wherein the groove extends at least partially over the bottom surface and the circular recess side wall and the groove is adapted to receive polymer through the primer flash aperture and over the bottom surface and the circular recess side wall.

One embodiment of the present invention provides a method of making a polymeric ammunition cartridge having wicking texturing about the projectile aperture.

Various embodiments are directed to systems, apparatus and methods for guiding flame within a device such as a thermal battery, wherein a first energetic produces a flame that is guided toward each of a plurality of secondary energetics via respective paths within the device.

A stun grenade for individual adjustment and situation-dependent adaptation of the number of active masses in situ. A switch mechanism is built into the stun grenade, enabling the simultaneous activation of different chambers inside the stun grenade in order to adjust the effect. The switch mechanism is formed by a tube and peripherally integrated boreholes and grooves. A different number of the chambers in the stun grenade is activated by the switch mechanism, thereby increasing or decreasing the active power.

One embodiment of the present invention provides a method of making a polymeric ammunition cartridge having wicking texturing about the projectile aperture.