Buddy Bottles With BEST Fittings Rebuildable Valve Configured for BSA SuperTen. Allows direct fitment to your BSA SuperTen without any modifications to the fore-end of the stock or the action. Fitted with fully rebuildable BEST Fittings Buddy Bottle Valve. Aluminium Buddy Bottles are Brand New Unused Luxfer 60mm dia 500cc or 50mm dia 280cc Flat Bottomed Buddy Bottles. NOTE: When upgrading your 50mm diameter 280cc Buddy Bottle on a fully shrouded barrel version to a 400cc or 500cc bottle, you will require a minimum of 6mm clearance between the 50mm bottle and the barrel shroud.