Patent ID: 6678983
Filing Date: 2004-01-20
Classification: F41A,F42B

Abstract:
A short-action firearm having an elongate chamber and bolt assembly comprising a tubular chamber and a bolt, selectively slidable longitudinally in a sliding direction between a retracted unlocked position and an extended locked position, said bolt providing a locked bolt face when said bolt is in said locked position, said chamber having a first end adjacent to said locked bolt face and a second end defined by a case mouth recess sized for operably receiving a cartridge with a projectile said chamber being capable of withstanding internal gas pressures of at least about 65,000 psi and being sized to matingly engage said cartridge so as to enable said cartridge to fire in said chamber with sufficient propellant to produce an internal gas pressure of at least 50,000 psi and to operably withstand said pressure, said bolt being capable of inserting said cartridge into said chamber and operably extracting said cartridge manually therefrom after firing of said cartridge at said pressure, said chamber having a first portion of substantially cylindrical shape adjacent to said first end and a second portion of a narrower substantially cylindrical shape adjacent to said second end, and a frusto-conical shoulder portion interconnecting said first portion and said second portion, said chamber having an overall length measured from said locked bolt face to said second end of said chamber, said first portion having a first portion inner diameter of at least about 0.53 inch at a location where said first portion interconnects with said shoulder portion, said overall length having a ratio to said first portion inner diameter at said location of no more than about 3.5, said first portion having a first portion length extending between said locked bolt face and said frusto-conical shoulder portion, said first portion length having a ratio to said first portion inner diameter at said location of no more than about 3, said chamber being sized for operably receiving a cartridge free of any protrusion on said cartridge extending radially outwardly beyond said cylindrical shape of said first portion of said chamber.