Why do you want to replace it? If yr expecting higher scores, you might get disappointed. I've never shot any better with my Aeron or Morini pcp than I do with my Tau 7; in the 360s ex 400. The Tau 7 grips are about Medium size. If you need smaller (thinner) than AlfaProj or Steyr are yr bet. Both originally have pencil like thin grips
The mk8 has been posted about recently on this forum if you do a search.