[tobnpr]

The materials are important, the epoxy choice must be very hard, and non-shrinking. I've used JB Weld with no problems, but it is runny- the Devcon putty is a better choice.

It's equally important to position the receiver correctly, that the proper depth of epoxy is achieved where it's needed, and that it's done in a stress free manner.
I use electrical tape wrapped around the barrel and stock, for even pressure.
Don't use clamps...