[Whiskey]

Inflator hose air that comes off your second stage and will only give you about 100 psi. Most air guns use higher pressure to be effective so you still need to add more air and increase the pressure. The question is how much? This information is normally in the manual and the pressure information is related to the number of pumps (when using hand pump) or can be checked by using a gun pressure gauge. You can probably contact Beuchat directly and ask them for the information. The European guns do use metric sizes orings and many of the smaller orings (trigger pin and pump air valve) are the real critical ones to get. I measured mine (did some conversions between metric and imperial) and bought them on Amazon from a supplier called Small Parts, Inc. They work well and guns operate fine.

I do know a guy who has a filling system; pressure control valve that is attached to a dive tank (also has a pressure gauge) and he can control the pressure and fill his guns quickly to the desired pressure.

A handpump works fine if you can get your hands on one or adapt one to the threading sizes that your guns have.

Beauchat may have an oring kit set available.