One more thing is,you may be attacking a problem that doesn't completely exist.Yeah,a lot of 1911's rattle and clank! But,if a match barrel is properly fitted to the slide,the barrel,slide and sights are all working together with a tight lockup.The frame /slide fit is much less involved in accuracy.
I will second the idea that a metal filled epoxy job is not likely to be successful and if you got it done,would present a reliability issue.
You might get away with something like Brownells Guncote moly filled bake on epoxy paint,but I don't think I would go that way
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