USA poster here. I have always liked my HWs and Dianas. I am more of a break barrel guy, but couldn't pass up a good price on a beautiful gun. I have always felt that Dianas gave up some efficiency with the fat and very long transfer port. I was quite surprised then on opening up this sliding breech underlever that the TP was still a very large 4mm. It was quite short perhaps 6-8mm but hard to measure as it was recessed.

I know Dianas aren't as popular on your Island except maybe with Barry. I really like my Dianas, especially those from the 80s. More specs and a little write up here. I hope the link doesn't violate any rules. Unfortunately not a lot of technical discussions of springers on most of the US sites.

https://www.gatewaytoairguns.org/GTA...topic=157430.0