I think the RWS 48 is comparable. Best place to find one /talk to tech rep is?????

There are several suppliers of aftermarket tuning kits for the RWS 48 and other air rifles. Here is one forum to ask in http://www.network54.com/Forum/184474/

Here is a well respected tuning kit supplier http://vortekproducts.com/ourstore/RWS48-Breech-Seal

There are several others if you google.

THANKS!!!