Hi Chaps. I'm currently rebuilding an old .22 Airsporter S Mk1 and would really appreciate some help from those of you who know more about them than I do (most of you I'd imagine!).

What's the best way to go about servicing the internals? I've been looking at the tuning kits from Chambers, but I'm sure there are others available too? What would be the best choice? I want to get it up as near the legal limit as possible or over - there's an FAC slot available for it with it's owner so that's no bother, but I don't know if it will go far enough over to be worth it or whether I should aim for around 11.5 and leave it at that?

It's a general pest control gun that I'm fixing up for a mate. It's got a bit of sentimental value to him so I'd like to do it properly.

Thanks in advance for any suggestions.