I am wanting to install a drop in stock to my (new to me) Savage 116 / 30 06. My first step was to disassemble the trigger/stock/barrel. Well.....I can't find via the web the proper size allen wrench to fit it. It isn't your standard or metric allen. Anyone have any idea what size it is. Anyone with info on a good stock that would look nice dressing a ss barrel. Thanks in advance.