As {HEAD ~ the taper} of the exterior blade surface 204B engages {TAIL ~ the mounting rail} 102, the taper may urge the blade 204 towards the weapon 104 
engages
As { HEAD ~ the taper } of the exterior blade surface 204B engages { TAIL ~ the mounting rail } 102 , the taper may urge the blade 204 towards the weapon 104
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH