I believe some manufacturers of double guns are now using high strength epoxies for bonding on ribs etc. Things like liner barrels which in the past would have been soldered are now epoxied in.

Epoxies in terms of shear strength etc are as strong as, if not stronger than solders. But there are many different solders as well as many different epoxies so general statements can easily be disproved.

Will epoxy bonded parts still be in place in 100 years time, like 100 year old ribs on a fine double are still absolutely fine. Only time will tell.