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A bonder is your best bet.
Among the recommended types would be a high grade epoxy from Brownell's. They're a leader in epoxy bonding for firearms. This could be mixed with powdered aluminum or stainless steel.
Another possible choice would be Loctite's "Black Max".
This is a modified super glue in a black rubbery bonder base that is specifically designed to mount gun sights and shotgun ribs.
From all accounts it really holds.
Results with either depend on prep. One thing that really helps is to roughen the parts to be bonded to give the epoxy a better grip, and by making sure the parts are surgically clean of any oils.
Any way you can give the bonder a "lock" also helps. This means getting the bonder into holes or under areas that physically prevent the parts from separating.
The keys to getting a good bond are getting the areas CLEAN, roughening to give the areas a "tooth" for the bonder to adhere to, and getting as good a mix of the bonder as possible.
To mix, you can use a powder scale to insure a perfect mix of component, and when you actually mix it together, you want to really mix it well.
Usually if the instructions call for mixing one minute, I mix at least 2 minutes, and try not to whip it and cause bubbles in the mix.
Using any kind of screws to assist in holding really helps.
As example using a couple of small machine screws or button-head screws from the inside up into the mount along with a bonder into the screw threads. Instead of major scope mounting screws think small screws and epoxy.
A good resource for this project would be to contact the Brownell's Tech Staff and talk to them. They'd have more info on what bonder to use.
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