| 摘要 |
An elongated tubular barrel is provided having front and rear end portions. The rear end portion of the barrel is externally threaded and removably threadedly engaged in a forwardly opening threaded counterbore formed in an elongated breech body having a bore formed longitudinally therethrough with its forward end opening into the aforementioned counterbore. A firing pin is longitudinally received and reciprocal in the bore formed through the breech body and the rear end of the breech body includes a diametrically enlarged endwise outwardly opening counterbore. An abutment is mounted on the rear end of the firing pin and is reciprocal in the last mentioned counterbore and projects at least slightly outwardly therefrom. The abutment and rear end of the breech body include coacting structure which yieldingly resist inward movement of the abutment into the last mentioned counterbore toward a position with the forward end of the firing pin projecting out of the forward pin of the bore and into the first mentioned counterbore. The coacting structure is operable, upon a forward thrust above a predetermined magnitude being applied to the abutment, to allow the abutment to move inwardly of the counterbore in a "snap" action to thereby enable sharp engagement of the forward end of the firing pin with the primer of a cartridge received in the rear end of the barrel bore.
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