Ok so the question is, if my fx impact is a .25 cal 600mm. Can I just buy the .22 cal 600mm liner instead of the whole $350 barrel kit? Are the outer diameter of the .22 and .25 the same? If they are the same it should be simple as swapping liners right? Or is the .25 liners thicker? Anyone have both can confirm if both liners .22 and .25 are same outer diameter?