{TAIL ~ The locking mechanism} has {HEAD ~ a breech block} which is locked with the stock and which can be released by a spring biased control member 
{ TAIL ~ The locking mechanism } has { HEAD ~ a breech block } which is locked with the stock and which can be released by a spring biased control member
TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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