In {HEAD ~ a proximate area} of 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 {TAIL ~ the stock} 3 
In { HEAD ~ a proximate area } of 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 { TAIL ~ the stock } 3
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH