A buddy of mine bought a Jukar rifle and who ever first bought it as a kit apparently started getting impatient to get it done. The cap box was whittled in a hurry and I'm trying to rectify the the situation. First I whittled out the hole better/deeper and in doing so had to get out most of the filler. The only way I can make it look good is to use a hardened filler/inlay that won't bust out or crack firing it. I figure the inlay around the box should be deep enough to do the job, maybe 1/8th or 3/16th.
What type of filler/plastic/hardener whatever should be the best choice to do the job and not crack. I really don't know about plastics or such and any help would be great. Here's a pic of what I'm trying to do.
Thanks guys.