When the breech block is in the locked position, a clearance is provided between the locking surface and the locking element on {HEAD ~ the side} facing away from {TAIL ~ the barrel} 
facing away from
When the breech block is in the locked position , a clearance is provided between the locking surface and the locking element on { HEAD ~ the side } facing away from { TAIL ~ the barrel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL