In {HEAD ~ a proximate area} of {TAIL ~ the support pin} 12, the breech block 4 is formed with a shoulder 17 for cooperation with a stop face 18 of a hook shaped stop member 13 which is positioned at the barrel distant end of the stock 3 
In { HEAD ~ a proximate area } of { TAIL ~ the support pin } 12 , the breech block 4 is formed with a shoulder 17 for cooperation with a stop face 18 of a hook shaped stop member 13 which is positioned at the barrel distant end of the stock 3
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