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US 2019/0093996 A1Published application
Reduced energy msr system
AssigneeVista Outdoor Operations LLC
InventorBryan P. Peterson
Life of this patent
Estimating the term…
Abstract
A system for firing reduced energy cartridges from a modern sporting rifle utilizes a bolt assembly weighing less than a conventional bolt assembly for such rifles and utilizes blow back for cycling the bolt assembly rather than gas operation. A bolt insert in a polymer bolt carrier of the bolt assembly has a projection that fits within a recess on the rear face of reduced energy cartridges. The reduced energy cartridges having a polymer casing, a rimfire power load for propellant, the power load recessed from the rear face of the casing. The power load seats in in the casing surrounded by a reinforcement liner embedded in the polymer casing.
Claims20
A reduced energy cartridge, comprising:
- a polymer case having a polymer case wall, the polymer case including:
- a generally cylindrical body portion defining a first outer diameter about a longitudinal axis, the body portion including a base portion defining a base lumen;
- a neck portion defining a second outer diameter about the longitudinal axis that is less than the first outer diameter, the neck portion defining a neck lumen;
- and
- a tapered portion extending between the body portion and the neck portion;
- a projectile including a first portion disposed within the neck lumen and a second portion extending forwardly beyond the polymer case;
- a reinforcement liner including a sleeve portion, a shoulder portion, and a flange portion, wherein:
- the sleeve portion defines one of a right-cylindrical geometry and a tapered-cylindrical geometry from a proximal end of the sleeve portion to a distal end of the sleeve portion, the sleeve portion being disposed at least partially within the base lumen and defining a sleeve lumen that is substantially concentric about the longitudinal axis,
- the shoulder portion extends radially outward from the proximal end of the sleeve portion and defines a radiused inner surface, and
- the flange portion extends from a proximal end of the shoulder portion and extends radially outward and beyond the shoulder portion and extends rearwardly beyond the base portion of the polymer case, the flange portion defining a minimum inner diameter that is the same as an inner diameter of the proximal end of the shoulder portion;
- and
- a propellant unit disposed in within the sleeve lumen, the propellant unit including:
- a housing including a body portion and a hollow rim portion that cooperate to define a cavity, the hollow rim portion being registered against the radiused inner surface of the shoulder portion of the reinforcement liner;
- a propellant charge disposed inside the cavity for producing a quantity of propellant gas;
- and
- a priming material disposed inside hollow rim portion for igniting the propellant,
- wherein the propellant unit and reinforcement liner cooperate to define a recess at a proximal end of the reduced energy cartridge,
- wherein the reduced energy cartridge is a rim fire cartridge.
15 more elements
A reduced energy cartridge, comprising:
- a polymer case having a polymer case wall, the polymer case including:
- a generally cylindrical body portion defining a first outer diameter about a longitudinal axis, the body portion including a base portion defining a base lumen;
- a neck portion defining a second outer diameter about the longitudinal axis that is less than the first outer diameter, the neck portion defining a neck lumen;
- and
- a tapered portion extending between the body portion and the neck portion;
- a projectile including a first portion disposed within the neck lumen and a second portion extending forwardly beyond the neck portion of the polymer case;
- an external reinforcement sleeve including a sleeve portion, a shoulder portion, a neck portion, and a flange portion, wherein:
- the sleeve portion defines one of a right-cylindrical geometry and a tapered-cylindrical geometry from a proximal end of the sleeve portion to a distal end of the sleeve portion, the sleeve portion surrounding the base portion and being substantially concentric about the longitudinal axis,
- the shoulder portion extends radially inward from the proximal end of the sleeve portion, and
- the neck portion extends proximally from the shoulder portion, and
- the flange portion extends from a proximal end of the neck portion and extends radially outward and extends rearwardly beyond the base portion of the polymer case, the flange portion and the neck portion defining a minimum inner diameter of the external reinforcement sleeve;
- and
- a propellant unit disposed in within the base lumen, the propellant unit including:
- a housing including a body portion and a hollow rim portion that cooperate to define a cavity, the hollow rim portion being registered against the base portion of the polymer case;
- a propellant charge disposed inside the cavity for producing a quantity of propellant gas;
- and
- a priming material disposed inside the hollow rim portion for igniting the propellant,
- wherein the propellant unit and the external reinforcement sleeve cooperate to define a recess at a proximal end of the reduced energy cartridge.
15 more elements
Dependencies are inferred from the claim text.