i know this is a dumb question but,. what is the part called that seperates the bbls. at the forarm end . can a new one be purchased or even a used one?the one on my 20 ga. bbl. doesn't look like most i have seen, and was told it was for a lightweight bbl. i have no idea, but the forarm wood doesn't fit this piece very well,( wide gap between wood and metal) and thought it would be better to change this part to a standard looking one.