If your barrel(s) are low recoiling cartridge users, you can shorten the stock an inch or so to compensate for eye relief. Many of the Leupold VX-2 scopes get close to the 5" ER mark, as does the 2.5. Bushnell makes an economy model low power variable that does 6". Nikon ha s a shotgun/muzzle loader item that is long. I don't think any of these will go flush with the breech, but will come close. My brain will not pull up the make and model, but I think someone makes a scout that works as close as 8-9." that would do it.

Good luck,

Jack

"Do not blame Caesar, blame the people...who have...rejoiced in their loss of freedom....Blame the people who hail him when he speaks of the 'new, wonderful, good, society'...to mean ,..living fatly at the expense of the industrious." Cicero