A pal of mine has just taken possession of a TX200 which is running too hot. It has obviously been tuned and is very smooth indeed. He is a registered firearms dealer so can deal with the FAC implcations in the short term, but wants to reduce the power and use as a non FAC air rifle (it’s not currently a registered firearm).

Is there a straightforward way to reduce the power by 4ftlbs or so without compromising the tuning? Maybe a non weighted spacer washer or something? I’m quite familiar with tuning in general but have never come across this particular issue myself before.

Thanks