Yes it can be fixed. To perfection by you doubtful. As said above, a bit of sawdust and glue filled into the hole after a backing is in place. You will still have a tiny blemish. If you can live with that, go for it. If not, then spend the money to get it done right. That’s a reasonably expensive gun, and if it were mine, I’d send it off for a complete repair and refinish.