Tried to put some shit in the gap. A lot harder then it sounds. Came to the conclusion that something needs to be attached/added to handguard front lug to fix the issue. So yes some sort of hard wood epoxy may work. Have to look around the basement and see what I gotAgree. Wood was sanded down for the previos gun. Shim where i5 is loose. I would be tempted to put a thin layerbof wood epoxi on the wooden lugs and then sand to fit