I am now the owner of this rifle. I have taken the rifle apart and there doesn't seem to be a sequence of numbers on the underside of the barrel. There is the number 30 stamped by itself, C9.5 and +05 on the action and -05 on the barrel plus a few other stamps presumably proof stamps? The stock has the serial number stamped into it. What was in the butt? Any info would be greatly appreciated. The reason I bought it was because a mate's father had one when we were kids and we used to marvel at the recoil. I have always wanted one.