Systems, mechanisms and methods are disclosed herein for absorbing recoil within a firearm. The presentation materials can easily be directed to any one of the display screens and any annotations can be saved for future use or simply deleted. The items travel a longitudinal path of travel to a separator wheel that staggers the items as they exit the sheet feeder. If the latched signal indicates complementary data, subsequent demodulated data are inverted and the inverted data are output.