FX harmonic tuners

Yes, From what I have gathered by by looking at the different calibers Fx has the outside barrel diameter is exactly the same. The difference is in the very end where the 12 by 20 threaded portion is. The hole inside there is either for the .177 .22 .25 .30 or .35. You just put in the insert for your caliber. Which makes it easy if you have a couple different calibers of the same barrel length. 

Them again you could just buy the one that screws onto the end with the different inserts.



Allen
 
I’m getting tired of FX announcing new products but can’t supply them. No dealer in the country has rifles, barrel kits, etc.

They do that so that you won't buy another air gun and wait patiently.... 



In the mean time they are busy figuring out what else they can do to make the product better and make you wait again.