According to Numrichs cross reference the Revelation A.K.A. Western Auto model 100 bolt action single shot rifle was made by Mossberg and called the Mossberg model 321. It seems some parts from the Mossberg models 321 and the model 320 will interchange. Also note that there were at least 4 different firing pins used in these two models and every one of them is different from the others. So if a firing pin is one of the parts you are in need of, you may have to send your old one that came out of the rifle (or a drawing of the one you need) to Numrichs to get the correct one. Hope that was of some help. Duffman.