any third party barrel to replace FX smooth twist (X or non-X)?

I am seriously considering buying a Daystate Wolverine "R" side lever in 177. I didn't want an FX due to the fact that the smooth twist barrel is known NOT to be all that good in the 177 platform and the X version does not come in 177 as of yet as far as I know. If there was a known barrel that fit the FX line from another source, it may have been a strong consideration also. So if anyone knows of a perfect fit off the shelf, I too would be interested.

Each brand machines their barrels to fit each line and or type of gun they sell. If you want an LW or CZ or Green Mountain or Lilja etc barrel to fit your gun you will have to have it machined to do so. No barrel manufacturer makes a drop in option for any airguns, or pb's I know of.