Patent ID: 6625916
Filing Date: 2003-09-30
Classification: F41A

Abstract:
A firearm having:a) a standard barrel and standard chamber of respective given diameter that are dimensioned to fire standard ammunition, the standard ammunition having a cartridge with a head end and a case that are of a diameter that is substantially equal to the diameter of said chamber; b) a standard upper receiver assembly for connection to said standard barrel; c) a standard lower receiver buttstock assembly; d) a magazine; and e) a training bolt carrier assembly comprising a training bolt carrier and a training bolt with a firing pin and training bolt recess with a base through which the firing pin will operate by advancement into said recess upon firing, said training bolt recess being dimensioned or shaped to exclude the seating of the head end of said standard ammunition in said bolt recess whereby the firing of standard ammunition is precluded, said training bolt carrier assembly being dimensioned for mounting in the firearm with said training bolt and training bolt carrier being free to recoil upon firing so as to effect cycling of the firearm through a blow-back operation, said firearm being in combination with a reduced-energy cartridge having: f) a case dimensioned to allow said reduced-energy cartridge to seat fully in the standard barrel chamber of said firearm, g) a head end which is dimensioned or shaped to seat fully in the training bolt recess, within reach of said firing pin upon firing, and h) a case that is divided into two portions that expand longitudinally upon firing to effect cycling of the weapon through blow-back operation.