Also, at the bottom of the primer feed tube is a red, green or blue plastic piece that has some round "wings" on it that holds the primer before it goes onto the primer slide. The wings on this plastic piece sometimes gets chewed up and causes feeding issues which leads to priming problems. Check to see if the wings on this plastic piece is in good shape. If they are chewed up, you will need a new one. I order 10 of these at a time in small and large so I have enough for spares to feed my many 1050's. This is a common priming problem when the plastic piece gets chewed up some.