Save some money on a complete barrle kit and buy this Huma Caliber Exchange and and
This caliber exchange set with V2 dual hole transferport and high flow pelletprobe makes it posible to change the caliber of your FX impact with the use of your excisting barrel sleeve and barrelshroud.
The set excists of a stainless steel barrel attachment with our V2 dual hole transfer port, a liner lock nut, a high flow pellet/slugprobe and the supporting o-rings for the optional FX liner inside the barrel sleeve (the liner itself is not included)
By using this kit, your excisting barrelsleeve and shroud, you can change the liner of your FX Impact with a liner of the same length and a different caliber.
Changing from a larger caliber to a smaller caliber does not require any modifications to your shroud or moderator, because the bore of the shroud and moderator will be large enough.
When you go upwards to a larger caliber, you need to check the bore of the shroud and moderator, and if needed open up the diameter of the bore of the shroud and moderator to match your new caliber;
Minimum bore diameter for a fixed shroud would be:
Cal .22 = 6,5 - 7 mm. bore
Cal .25 = 7,5 - 8 mm. bore
Cal. 30 = 8,5 - 9 mm. bore
Very good product very good fit and finish