Release of the cover strap causes movement of the hinge by the spring to position the magazine in a position for facilitating one handed loading of the magazine into {HEAD ~ an automatic pistol} by {TAIL ~ the user} 
by
Release of the cover strap causes movement of the hinge by the spring to position the magazine in a position for facilitating one handed loading of the magazine into { HEAD ~ an automatic pistol } by { TAIL ~ the user }
OTH OTH OTH OTH OTH OTH 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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL