The present invention provides a single piece polymer ammunition cartridge and polymer ammunition and methods of forming a single piece polymer ammunition cartridge and polymer ammunition.

A shaped charge assembly for selectively expanding a wall of a tubular includes a housing comprising an outer surface facing away from the housing and an opposing inner surface facing an interior of the housing. First and second explosive units each includes a predetermined amount of explosive sufficient to expand, without puncturing, at least a portion of the wall of the tubular to form a protrusion extending outward into an annulus adjacent the wall of the tubular.

An explosive downhole tool includes a housing having an upper housing part on one side of a window section and a lower housing part on an opposite side of the window section. An explosive charge is provided within the housing for at least one of cutting and expanding the wall of the tubular. The outer surface of at least one of the upper and lower housing part is rounded so as to be devoid of corners. The rounded surface eliminates the presence of sharp corners that may catch on restrictions or protrusions in a wellbore so that the downhole tool is more easily conveyable within a wellbore. Another explosive downhole tool includes fins extending from the housing. The fins have a height that decreases in a direction away from the housing. The shape of the fins enables the downhole tool to be more easily conveyable within the wellbore.

Disclosed is a firing device for shock tube. Shock tube is a non-electric explosive initiator, well known to those of ordinary skill in the art. The firing device is configured to provide a redundant dual-ignition capability for connected shock tube. In this way, a second attempt to initiate the shock tube can be made immediately following a failed first attempt. To provide this functionality, the firing device includes a primer tray that can be preloaded with two primers. Using an operably connected selector, the primer tray can be rotated between use positions that individually locate each primer for detonation.

The present invention provides a diffuser cup adapted to fit a primer recess in an ammunition cartridge comprising: a diffuser ring sized to fit in a primer recess for an ammunition cartridge comprising a diffuser top surface opposite a diffuser bottom surface, a diffuser aperture positioned through the diffuser top surface and the diffuser bottom surface such that the diffuser aperture can align with a flash hole, a diffuser neck positioned about the diffuser aperture to extend away from the diffuser top surface, wherein the diffuser neck is sized to fit at least partially through the flash hole; a ring connected to the diffuser neck, wherein the ring comprises a ring aperture connected to the diffuser neck to align the ring aperture and the diffuser aperture; and a cup wall attached to the diffuser ring to extend away from the diffuser bottom surface, wherein the cup wall is configured to frictionally fit a primer and frictionally fit a primer recess.

The present invention provides a diffuser ring adapted to fit a primer recess in an ammunition cartridge comprising: a diffuser ring sized to fit in a primer recess for an ammunition cartridge comprising a diffuser top surface opposite a diffuser bottom surface, a diffuser aperture positioned through the diffuser top surface and the diffuser bottom surface such that the diffuser aperture can align with a flash hole, a diffuser neck positioned about the diffuser aperture to extend away from the diffuser top surface, wherein the diffuser neck is sized to fit at least partially through the flash hole, and a ring connected to the diffuser neck, wherein the ring comprises a ring aperture connected to the diffuser neck to align the ring aperture and the diffuser aperture.

The present invention provides a subsonic ammunition cartridge including a polymeric casing body comprising a generally cylindrical hollow polymer body having a body base at a first end thereof and a mouth at a second end to define a propellant chamber; a propellant insert positioned in the propellant chamber to reduce the internal volume of the propellant chamber, wherein the propellant chamber has an internal volume that is between 25 and 80% less than the open internal volume of a standard casing of equivalent caliber; and a primer insert positioned at the body base and in communication with the propellant chamber.

The present invention provides a subsonic ammunition cartridge including a polymeric casing body comprising a generally cylindrical hollow polymer body having a body base at a first end thereof and a mouth at a second end to define a propellant chamber; a propellant insert positioned in the propellant chamber to reduce the internal volume of the propellant chamber, wherein the propellant chamber has an internal volume that is between 25 and 80% less than the open internal volume of a standard casing of equivalent caliber; and a primer insert positioned at the body base and in communication with the propellant chamber.

The present invention provides a subsonic ammunition comprising: a primer insert comprises a top surface opposite a bottom surface, a substantially cylindrical coupling element extending away from the bottom surface forming, a primer recess in the top surface that extends toward the bottom surface, a primer flash aperture positioned in the primer recess to extend through the bottom surface, a flash aperture groove in the primer recess that extends circumferentially about the primer flash aperture, and a flange that extends circumferentially about an outer edge of the top surface; a polymeric casing body comprising a generally cylindrical hollow polymer body molded over the substantially cylindrical coupling element, into the primer flash aperture and into the flash aperture groove to form a flash hole and extending toward a mid-body coupling joint; a nose comprising a projectile aperture that extends to a neck connected to a shoulder that transitions from the projectile aperture to a nose coupler, wherein the nose coupler is connected to the mid-body coupling joint; a propellant chamber formed between the projectile aperture and the primer flash aperture; and wherein the generally cylindrical hollow polymer body comprises a thickened wall that reduce the internal volume of the propellant chamber by at least 10%, wherein the thickened wall comprises a first passage comprising a first passage comprising a first aperture having a first diameter about the diameter of the flash hole that extends to a first top surface and a second passage that extends from the first top surface toward the neck, wherein the second passage has a second diameter about the size of the projectile aperture; a primer fitted in the primer pocket; a propellant disposed in the propellant chamber; and a projectile positioned in the projectile aperture.

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.