There's a seal for the body of the pin down there, hardened and sticking to the wall.
A full-power rifle that shoots BBs or.177 pellets, Daisys Powerline 901 sends BBs screaming downrange at 750 fps (715 for pellets)! It comes with the original box, operational manual, one co2 'Jetts' cartridge, and an open box almost full of pellets. Punching out the pin that retains the BB shuttle. It has a raised area so can only go in or out one way. The nut has threadlocker or sealant on it.