Crosman Model 1322 Medalist Crosman Model 1322 Medalist Pump Hand Pistol?

Crosman model 1322 Medalist pump hand pistol? - crosman model 1322 medalist

I have this very old pump air rifle (see question) to the model. It was crazy in the 60s, then on the site is a little different, but it works if you want a comparison. The problem is that the buttocks on the front page, that is the BB or pellet into force, seems to have the ball and simply dropped into the ravine. It seems that the magnet is missing or something. No idea how to fix the problem?