{TAIL ~ The breech block} has {HEAD ~ at least one bore} which receives a locking element supported for radial movement in the bore 
{ TAIL ~ The breech block } has { HEAD ~ at least one bore } which receives a locking element supported for radial movement in the bore
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH