Patent ID: 7231864
Filing Date: 2007-06-19
Classification: F41A

Abstract:
1. A firearm apparatus, comprising: a gun housing which includes a front gun housing portion, a rear gun housing portion, and an intermediate gun housing portion located between said rear gun housing portion and said rear gun housing portion, and wherein said gun housing includes a barrel support channel between said front gun housing portion and said intermediate gun housing portion, a reciprocating barrel housed inside said gun housing, wherein said barrel includes a piston-sleeve-contained barrel portion located substantially in said front gun housing portion, an intermediate barrel portion located substantially in said intermediate gun housing portion, and a barrel chamber portion located substantially in said rear gun housing portion, wherein said piston-sleeve-contained barrel portion includes a barrel piston head and primary first gas ports located behind said barrel piston head, a piston sleeve housed in said front gun housing portion and in front of said barrel support channel, wherein said piston sleeve receives said piston-sleeve-contained barrel portion, and wherein said barrel piston head is in sliding contact with said piston sleeve, wherein proximal portions of said barrel piston head, said piston-sleeve-contained barrel portion, and said piston sleeve form a pressure space, a recoil spring retainer portion connected to said intermediate barrel portion between said barrel support channel and said barrel chamber portion, a main recoil spring located between said barrel support channel and said recoil spring retainer portion, a trigger/firing pin mechanism assembly supported by said gun housing and extending through portions of said front gun housing portion, said intermediate gun housing portion, and said rear gun housing portion, a cartridge ejection/loading assembly supported by said rear gun housing portion, and a cartridge magazine assembly supported by said rear gun housing portion and in communication with said cartridge ejection/loading assembly.