Gun shops/smiths in Hertfordshire?

[Segata]

Not convinced Park Street have a chrono on site, but they might. Can't say I've ever asked them. I know most of their smithing work goes up the road to the place I mentioned.

If you do anything to your BSA and want to chrono it, I can do that for you.

Thank you, was just where Tinbum and Tony said I need to make sure it doesn't breach the limit when the kit goes in.

[Willenium]

Yes it's advisable to test while doing any work. A small change can make quite a difference to power level. With a springer (and especially a budget/BSA one) you'll probably not want it running too near the limit, as they often feel noticeably less pleasant to shoot.

[MartynB]

Yes it's advisable to test while doing any work. A small change can make quite a difference to power level. With a springer (and especially a budget/BSA one) you'll probably not want it running too near the limit, as they often feel noticeably less pleasant to shoot.

Plus power can go up as they bed in