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