Hi guys, my brother has an Airtec AT22. Power is absolutely pathetic (more than usual...) About 15 cm pellet drop over 7M! It's also pretty inconsistent. Some shots are what I would imagine to be full power, but most are somewhere between that and practically just dropping out of the barrel.

How can I make it a bit better (I know it will always be crap.) And does anybody know whether I'd be able to put a B2 / B3 spring in there?

Thanks guys.