The present invention provides a polymer ammunition cartridge having a primer insert having: a top surface; a bottom surface opposite the top surface; a coupling element that extends from the bottom surface, wherein the coupling element comprises an interior surface and an exterior surface, wherein the interior surface comprises: a transition region that transitions from the bottom surface to a second segment wherein the transition region has a radius of from 0.02 to 0.2; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.02 to 0.18 inches and the second segment has a second segment distance from 0.02 to 0.18 inches, wherein the second segment has a second segment angle from +3 to −3 degrees relative to the first segment angle and the first segment has a first segment angle from +6 to −6 degrees from perpendicular to the top surface; a primer recess in the top surface that extends toward the bottom surface; a primer flash aperture positioned in the primer recess through the bottom surface; and a flash aperture groove in the primer recess and positioned around the primer flash aperture and adapted to receive a polymer overmolding through the primer flash aperture.

The present invention provides an injection molded primer insert for polymer ammunition comprising: a top surface opposite a bottom surface; a primer flash hole aperture positioned in the top surface extending through to the bottom surface; a substantially cylindrical coupling element extending away from the bottom surface forming an interior surface inside the substantially cylindrical coupling element and an exterior surface; 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, and a flange that extends circumferentially about an outer edge of the top surface, wherein the flange is adapted to receive a polymer overmolding.

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 invention relates to a shotgun cartridge comprising a case (12) of internal diameter d.sub.INT and a base (14) with a primer (16), the powder (18), a wad (22) and the shot (24), as well as an obturator (20) arranged between the powder (18) and the wad (22), characterized in that the obturator (20) is made of biodegradable material with plastic deformation properties, and comprises a central disk (25) and ribs (26) together forming a one-piece element with the disk, the assembly having an outer diameter d.sub.EXT, the ribs (26) comprising upper ribs (27) and lower ribs (28), these ribs (26) forming a non-zero angle with the plane of the disk (25), the obturator having a nominal outer diameter d.sub.EXT, the ribs being able to take at least one other position in which said ribs (26) are in the plane of the disk (25), the outer diameter being D.sub.EXT. The invention also concerns a method for producing a shotgun cartridge.

One embodiment of the present invention provides a stamped metal primer insert for a polymeric ammunition cartridge comprising: a top surface having a stamped flange that extends circumferentially about an outer edge of the top surface; a stamped coupling element that extends from the flange to a coupling tip; a stamped inner coupling element from the coupling tip to a bottom surface, wherein the bottom surface is opposite the top surface; a stamped primer recess in the top surface that extends toward the bottom surface; a primer flash aperture in the primer recess through the bottom surface; and a groove stamped in the primer recess around the primer flash aperture adapted to receive a polymer overmolding.

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.

An attachment assembly includes a conically tapered missile body interface surface of a missile body attachment interface wedged against a conically tapered missile component interface surface of a missile body attachment interface. The missile body attachment interface also includes an engagement rod for locked engagement by a hook of the missile component attachment interface. Specifically, the missile component attachment interface includes an auto-adjusting assembly having a series of pivoting arms connected to a rotatable engagement drive at a first end thereof and a hook at a second end thereof. The auto-adjusting assembly is moveable between a first position and a second position, and between the second position and a third position. The missile component attachment interface includes a pre-loaded over-center mechanism operably coupled to the auto-adjusting assembly and configured to lock the hook in engagement with the engagement rod in the third position.

The invention comprises a projectile, compliant with the U.S. Code of Federal Regulations and/or the United States Code, such as 18 U.S.C. § 921(a)(17)(B), which regulates bullet materials and mass fractions. For example, the invention is to a projectile comprising: (1) a metal core, such as a cobalt alloy core, including a base and a tip, where the base and the tip are separated by a core length along a z-axis running longitudinally through a center of the metal core; and (2) a jacket circumferentially attached to the metal core, the jacket surrounding at least fifty percent of the core length of the metal core, where the jacket includes: a polymer and a first jacket radial thickness along at least a section of an interquartile portion of the core length of greater than 0.03 inches.

Components of a projectile are held together by a captive collar that is internal to the projectile. The internal captive collar is rotated about a central boss, allowing external threads on the collar to engage one of the mating components and pull that mating component into the other mating component in an axial only translation. The internal captive collar is rotated using a geared-key during assembly. This key engages a geared crown feature of the captive collar, allowing it to rotate. After assembly, the gear key is removed from the assembly. Castellated features nest within slots to transmit torque in the assembled projectile.

A cartridge case for ammunition may include a rotationally shaped case jacket for receiving a projectile and an annular base piece for receiving a primer and the case jacket. An annular wall of the base piece on the side of the case jacket is conically shaped at least in sections with respect to its axis of rotation. A retaining section of the case jacket on the side of the base piece is adapted in shape thereto so that the retaining section engages at least in sections behind the annular wall for fastening the case jacket and the base piece to one another. A distancing of the base piece and case jacket from each other may be prevented in the direction of the axis of rotation. The conical annular wall and the retaining section may be formed by plastic deformation of the base piece.