Abstract: A polymer-based cartridge for subsonic ammunition with a first end having a projectile disposed in a mouth, a shoulder forming a bottleneck cartridge; and at least a polymer wall between the first end and a second end opposite the first. An insert is joined to the second end, having an extraction rim and groove, a primer pocket communicating with a flash hole, and the flash hole communicating with a propellant chamber. A sleeve section has a metal or a metal alloy, extending from the insert toward the first end, and at least partially covered by the wall. The sleeve section and the wall form the propellant chamber having a thickness at least 1.25 times greater than a standard thickness of a wall of a standard cartridge. The propellant chamber between the mouth and the insert is unobstructed, and comprises a powder load having a load density greater than 40%.

Abstract: A high strength polymer-based cartridge casing inclosing a volume includes a first end having a mouth, a neck extending away from the mouth, a shoulder extending below the neck and away from the first end, a cartridge body formed below the shoulder, a insert attached to the cartridge body opposite the shoulder, and a projectile disposed in the mouth having a particular caliber. The neck has a neck thickness that is about 25% to about 125% greater than a standard neck thickness for the particular caliber as detailed by a standards organization. Also, the neck, the shoulder, and the cartridge body are formed from a polymer.

Abstract: A high strength polymer-based cartridge casing can include an upper polymer component, molded from a polymer. The upper component has a first end having a mouth, at least a wall between the first end and a second end of the upper component opposite the first end, an overlap portion extending from the wall near the second end. An upper insert is included and has a first end and an opposing second end, a molded area disposed approximate the first end, that engages the overlap portion to join the upper polymer component and the upper insert, and an insert engagement area disposed approximate to the second end. Further, a lower insert has a front end and a back end, an upper insert engagement area engaging with the insert engagement area, a rim and groove disposed around an outside of the lower insert, and a primer pocket disposed inside the back end. Lastly, a flash hole is inside the lower insert and communicates between the primer pocket and upper polymer component.

Abstract: A polymer-based cartridge for subsonic ammunition with a first end having a projectile disposed in a mouth, a shoulder forming a bottleneck cartridge; and at least a polymer wall between the first end and a second end opposite the first. An insert is joined to the second end, having an extraction rim and groove, a primer pocket communicating with a flash hole, and the flash hole communicating with a propellant chamber. A sleeve section has a metal or a metal alloy, extending from the insert toward the first end, and at least partially covered by the wall. The sleeve section and the wall form the propellant chamber having a thickness at least 1.25 times greater than a standard thickness of a wall of a standard cartridge. The propellant chamber between the mouth and the insert is unobstructed, and comprises a powder load having a load density greater than 40%.

Abstract: An insert for a high strength polymer-based cartridge casing can include an outside, an inside formed within the insert, and a back end disposed at a rear of the cartridge casing. The back end includes a rim and groove disposed around the outside of the insert and a primer pocket disposed inside the back end. Also included is a front end, opposite the back end, having an overmolded area disposed around the outside of the insert above the primer pocket and a basin, having a depth, formed inside the overmolded area. A flash hole can be included inside the insert and communicating between the primer pocket and the basin. The flash hole has a perimeter and a ring disposed around the perimeter of the flash hole, including a height starting at a bottom of the basin, disposed toward the front end, and less than the depth of the basin.

Abstract: An insert for a high strength polymer-based cartridge casing can include an outside, an inside formed within the insert, and a back end disposed at a rear of the cartridge casing. The back end includes a rim and groove disposed around the outside of the insert and a primer pocket disposed inside the back end. Also included is a front end, opposite the back end, having an overmolded area disposed around the outside of the insert above the primer pocket and a basin, having a depth, formed inside the overmolded area. A flash hole can be included inside the insert and communicating between the primer pocket and the basin. The flash hole has a perimeter and a ring disposed around the perimeter of the flash hole, including a height starting at a bottom of the basin, disposed toward the front end, and less than the depth of the basin.

Abstract: A high strength polymer-based cartridge casing can include a first end having a mouth and a neck extending away from the mouth. Next, a shoulder extends below the neck and away from the first end. The cartridge can have a frangible portion capable of being split upon discharge of a projectile. A projectile can be disposed in the mouth.

Abstract: An example of a high strength polymer-based linked cartridge can have a casing inclosing a volume with a mouth and a neck extending away from the mouth. Next, there is a shoulder extending below the neck and a body extending below the shoulder. The body has a finger disposed on a first side of the body, the finger having a length and at least two fingers disposed on a second side of the body. The body also has a pawl catch disposed on a third side of the body. The at least two fingers can be spaced from each other a distance approximately equal to the length, and they can be configured to engage a finger disposed on a second cartridge.

Abstract: A high strength polymer-based cartridge casing includes an upper component of polymer, a bullet of a standard weight, a lower component of polymer, and an insert. The upper component has a shoulder portion and an upper component inner wall has a first diameter extending from the shoulder. The lower component has a lower component inner wall having a second diameter. The upper and lower component inner walls form a propellant chamber; and the first and second diameters reduce a volume of the propellant chamber. The reduced volume of the propellant chamber permits only enough propellant to propel a bullet engaged in the cartridge casing at subsonic speeds.

Abstract: A high strength polymer-based cartridge casing can include a first end having a mouth and a neck extending away from the mouth. Next, a shoulder extends below the neck and away from the first end. The cartridge can have a frangible portion capable of being split upon discharge of a projectile. A projectile can be disposed in the mouth.

Abstract: An insert for a high strength polymer-based cartridge casing can include an outside, an inside formed within the insert, and a back end disposed at a rear of the cartridge casing. The back end includes a rim and groove disposed around the outside of the insert and a primer pocket disposed inside the back end. Also included is a front end, opposite the back end, having an overmolded area disposed around the outside of the insert above the primer pocket and a basin, having a depth, formed inside the overmolded area. A flash hole can be included inside the insert and communicating between the primer pocket and the basin. The flash hole has a perimeter and a ring disposed around the perimeter of the flash hole, including a height starting at a bottom of the basin, disposed toward the front end, and less than the depth of the basin.

Abstract: A high strength polymer-based cartridge casing can include a first end having a mouth and a neck extending away from the mouth. Next, a shoulder extends below the neck and away from the first end. The cartridge can have a frangible portion capable of being split upon discharge of a projectile. A projectile can be disposed in the mouth and a relief can be disposed on the neck near the mouth and projectile. The relief can form a gap between the neck and the projectile to receive an adhesive.

Abstract: A high strength polymer-based cartridge casing can include a first end having a mouth and a neck extending away from the mouth. Next, a shoulder extends below the neck and away from the first end. An inside of the shoulder can be shaped in at least one of a convex or concave shape. The shoulder can have unequal outside and inside shoulder angles. Further, the inside shoulder can be textured or coated.

Abstract: A high strength polymer-based cartridge casing can include a first end having a mouth and a neck extending away from the mouth. Next, a shoulder extends below the neck and away from the first end. The cartridge can have a frangible portion capable of being split upon discharge of a projectile. A projectile can be disposed in the mouth and a relief can be disposed on the neck near the mouth and projectile. The relief can form a gap between the neck and the projectile to receive an adhesive.

Abstract: An example of a polymer-based machine gun link can include a first side having a finger to hold a cartridge and a second side, opposite the first side, having at least two fingers to hold a second cartridge. A stem can join the first side and the second side the two fingers are smaller than the finger and spaced along the stem so that the finger fits between the two fingers. All of the finger, the two fingers, and the stem are made from polymer.

Abstract: A cartridge for ammunition has a base with an axial end section. An annular wall extends from the enlarged outer peripheral lip section to an opposite end. The axial end section has a primer cavity therein and a radially outwardly extending peripheral extraction lip. An annular ledge is axially positioned at an inner end of said primer cavity and radially extends inwardly from said annular wall. A passage has a reduced diameter compared to the primer cavity and extends through the annular ledge. A main charge cavity is at an opposite side of the ledge from the primer cavity. A knurl section is on an outer surface of said cylindrical wall. A cartridge case is attached to the base about said knurl section.

Abstract: A high strength polymer-based cartridge casing includes an upper component of polymer, a bullet of a standard weight, a lower component of polymer, and an insert. The upper component has a shoulder portion and an upper component inner wall has a first slope extending from the shoulder. The lower component has a lower component inner wall having a second slope. The upper and lower component inner walls form a propellant chamber; and the first and second slopes reduce a volume of the propellant chamber. The reduced volume of the propellant chamber permits only enough propellant to propel a bullet engaged in the cartridge casing at subsonic speeds.

Abstract: A cartridge for ammunition has a base with an axial end section. An annular wall extends from the enlarged outer peripheral lip section to an opposite end. The axial end section has a primer cavity therein and a radially outwardly extending peripheral extraction lip. An annular ledge is axially positioned at an inner end of said primer cavity and radially extends inwardly from said annular wall. A passage has a reduced diameter compared to the primer cavity and extends through the annular ledge. A main charge cavity is at an opposite side of the ledge from the primer cavity. A knurl section is on an outer surface of said cylindrical wall. A cartridge case is attached to the base about said knurl section.

Abstract: A high strength polymer-based cartridge casing can include a first end having a mouth and a neck extending away from the mouth. Next, a shoulder extends below the neck and away from the first end. The cartridge can be have a frangible portion capable of being split upon discharge of a projectile. The shoulder can have unequal outside and inside shoulder angles. The casing can also include an insert having a rim at one end or a plurality of ribs extending longitudinally along a wall between the shoulder and the bottom of the cartridge and spaced radially from each other around a circumference of the wall. A projectile can be disposed in the mouth and a relief can be disposed on the neck near the mouth and projectile. The relief can form a gap between the neck and the projectile to receive an adhesive.