A real simpls fix to fit the old as well as the new style Crosman breech. Here's some photos I posted some time back when I was shrouding the new Crosman Discovery.
I used an RJ Machine high rise breech which required milling the cocking pin slot, on the bottom side, through the rear hold down bolt hole. I also had to relocate the 4-48 small breech hold down screw location in the RJ breech further back to accommodate the screw hold position in the Discovery then fill the old hole.
Milling out the slot would be especially helpful when using the new style breech, also when removing the bolt without removing the breech and when using an extended bolt probe.
Also for those that like to get into the guts of your Disco's this might help.
