I have some 20 cal barrels thou
to replace the barrel with a smaller caliber
we will have to make a new bolt also
this factory barrel has a internal o-ring grove
so it makes it a little more of a challenge for a barrel swap
a new probe with o-ring on it would be the easiest way to go down on caliber , the probe would have to be made anyway
there are a few way to go with it grooving the inside of the barrel for a o-ring is a pain in the A$$.but doable
A 25 cal would take a new breech to do it, or modify the stock one ,and sleeve up the probe size
if the fatory breech was to be opened up so a 25 probe would fit , you could always
sleeve it back down with some brass to go back to the sub 22 caliber platforms
any way food for thought ,any one want to change calibers yet
So when is your going to be arriving , i know its on your short list

swift