Did the same with a Model 11 Blind mag. For me the hardest part was removing and replacing the box w/o deforming it. I found at the Dollar Store some small packets of modeling clay. They were very inexpensive and one package filled the whole action. Stuff didn't harden over night and was easily removed. Also used Marine-Tex and Johnson paste floor wax as the release agent.
Quick impression. I found the Marine-Tex to be a bit thicker in consistency and maybe didn't flow as well as some of the other epoxy's. But it has still done a nice job and has been solid for over 3 years now.
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