Hi EBD10,As I can recall,the RWS 52 is basically the RWS 48 with fancier stock.The RWS 54(or the RWS Airking as it used to be called somrtimes)has a special mechanism,that is said to make the airgun almost recoilless.And it was always more expensive than any of the RWS spring piston airguns.I have not shot one so can't comment on how good the non recoil feature works.I have shot the 48 and it is a very nice airgun.I have not shot the fancier RWS 52.
