Ha ha, Hiya mate
,
Pcp/Co2 conversion Etc in my opinion is the only way to go ! Just TOO LITTLE ,
Your afforded low stress & You even have to turn it down to remain legal ? They knew what they were doing when Bsa made the Spifire,
It works with all the older Bsa,s & Now even with the Mercury, ( I only just started a thread before this on Inline valves ) You must have read my mind.
Ged.