I just purchased an older style BT-99 Plus. Being unfamiliar with the gun I'm not sure how to adjust the rib. I'm assuming it requires moving the rib either up or down in the back, but how is this done? Any help would be greatly appreciated.
Here's some information on the BT 99 Plus. I shot one pretty well 20 some years ago. I just needed a little higher POI from it's maximum 9" setting.
There is a screw on the top rear of the rib for adjusting it and there is a roll pin in the front on the side for adjustment.