Sunkorite

[ireload2]

Brian,
Maybe you think you have bead blasted an epoxy finish off but probably not an epoxy polyamide. There is a good reason Sunkorite is an obsolete finish and that is because it is nowhere as tough as newer materials. The stuff crusts up and degrades with time and exposure to chemicals. The epoxy polyamide is much more chemical resistant. This based on more than a decade of work in a military contractor's shop using the various urethanes and epoxies specified for military hardware.
If you like to shoot your rifle until it smokes just use barbecue black or black exhaust manifold paint and bake it on. Either one is better than nothing.