Any action taken with epoxy will require a very clean surface for effective bonding. As several replies have noted, the cleaning and surface treatment will show as a different spot from the rest of the barrel. 

Before the days of true pistols scopes , a project to bond a Weaver K4 with a Litschert Long Eye Relief adaptor to a Ruger Blackhawk .30 Carbine required us to remove all the blueing. This was a noticeable bright spot. And, after several cylinders of full- house loads, the scope popped off the barrel. 

Despite the added cost, consider a new barrel for shooting since you can set it up as you want. When done, you can reinstall the original barrel. The cost of a new barrel and installation will probably be equivalent to a custom scope mount solution.

pmcfall wrote on Feb 27^th, 2018 at 9:47am:


Certainly is on high-power handguns--just to prevent the scope from sliding in the rings requires an extra ring and/or rosin, Locktite, etc., inside the rings.  However, an epoxied mount has stayed on a Ruger .22 I have for over 30 yrs.  Not that I've used it a great deal--quickly found that even a 2.5X scope was too jittery except from a rest.