I am just in the process of buying a Feinwerkbau 700 Evolution Top 10 metre match rifle. The shop had no way to fill the tank but did have the Feinwerkbau filling adaptor with the gun. It has 5 male threads denoting it was a fitting for 232 bar cylinders. The 300 bar cylinders require 7 threads on the male end of the adaptor to fill the cylinder filling point without letting any air escape.

I made a call to Best Fittings and they sold me the linked item and fitted a quick release fitting for a standard hose. Job done.

https://www.bestfittings.co.uk/shop/...e-18-bsp-male/

The overall cost including first class postage was just £24. Fantastic service and I spoke with Tracy during several calls, just to confirm that I was buying the most suitable items. Very helpful and a big shout out to Best Fittings. I have never used them before and I have no connection to the company. It is great to see that customer service is alive and well. Highly recommended and saved me buying a 232 bar cylinder.