This set is in .177 caliber

Huma-Air Caliber Exchange Set with V2 Dual Hole Transfer Port and High Flow Pin allows you to change the caliber of your FX Panthera with the use of your existing barrel sleeve and barrelshroud.

Features:

• The set Includes the V2 dual hole transfer port, a Liner Lock Nut, a High Flow Pin Probe and the supporting o-rings for the optional FX liner inside the barrel sleeve (the liner itself is not included). 
• The V-shaped transfer opening makes sure you will have the maximum and smoothest air passage area. The middle support bridge divides the transfer port into a dual hole port and the middle bridge makes sure the pellet or slug nose cannot fall into the enlarged transferport hole, but will be guided smoothly by the middle bridge into the barrel.
• The pin probe can be used for slugs and pellets and makes sure you will have the maximum air flow trough the transferport towards the projectile.

IMPORTANT NOTES FROM HUMA AIR:

• FX uses a medium strength treadlocker to fixate the transferport to the barrel to prevent the barrel coming loose. We strongly advice you to use a treadlocking adhesive like Loctite® 2400.
• Please check the FX Factory Exploded View before dismanteling the rifle.
  
• Barrel system A1-A18 runs thru a pressurized tube, faulty dismantling or faulty re-assembly can cause serious injury to yourself and other living beings in the proximity and can cause serious damage to the gun and property close by.
• Locking screw A11 holds the barrel system which runs thru a pressurized tube, faulty dismantling or faulty re-assembly ccan cause serious injury to yourself and other living beings in the proximity and can cause serious damage to the gun and property close by.
• 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 shroud would be:
  • Cal .22 = 6,5 - 7 mm. bore
  • Cal .25 = 7,5 - 8 mm. bore
  • Cal. 30 = 8,5 - 9 mm. bore