valves are now compatible with the incredibly popular FX Impact M3! BEST Fittings Replacement valve assembly for your FX AirGuns Buddy Bottle. Valve to Fit 220cc, 300cc, 500cc, 580cc Carbon, and 400cc, 500cc Alloy Buddy Bottles M18 x 1.5 Thread Also suitable for the following FX Air Guns. FX Crown, FX Crown Arrow FX Impact, FX Impact Mk11 FX Boss FX Royale 500, FX Royale 400 FX Verminator, FX Verminator Extreme And possibly any further models released employing a removable Aluminium or Carbon Fibre Buddy Bottle with M18 x 1.5 threads