FX Barrel attachment question?

[Esab]

Hy guys, having a barrel attachment .30 cal Fx barrel attachment and trying to attach to it the huma V2 transfert port in .25 cal…
Am I gonna have any accuracy/feeding problems in your opinion? Going to use a .25 slug probe and .25 barrel , is it possibile or i need a calibre exchange set?.
Thanks

 

[Airgunmann]

Caliber change kit I think the inside diameters are different for the different liners 30 cal OD may be larger than the 25 cal liners

 

[Ca_Varminter]

Barrel extension- #5 is caliber specific too!!
It is sized to the outside diameter of the Barrel!!!
It contains an O-ring the seal around the end of the barrel!
So It needs to replaced too!!

 

[Esab]

Thanks buddy!