as far as know barrels and breech block are one unit, i guess a clever guy could install a LW barrel after some lathe work but it is above my pay grade
PA has a complete assembly in .25
That might not be the case.
I'm having memory flashes about this subject, because I seem to remember reading some years back that a dealer was buying barrel blanks from another manufacturer and replacing them in the breech blocks. Because of it, he allowed you to choose the length of the barrel you wanted, and he cut the new barrel to that length before insertion.
For sure the barrel blank is pushed into the separate breech block and fastened in-place with a pin that's driven into the block from the side of the breech. If you look very-closely at the side of the breech block, at least on some of them, you can see the faint round outline of the pin. (IME it's easier to see the pin on Diana barrels). I think it's hard to see the round outline because the hole in the block is drilled just big enough for the pin, the breech and pin are polished after the pin has been inserted, then they're blued together.
That said, maybe the tool the dealer was using to remove the old barrel was in fact a lathe.
let me state i know the barrel and block are 2 parts but if you can't find a source for the 2 parts and they only come as one part then you can't buy the barrel
and if someone at some time did have the barrels, that might be of some help if you knew who that person was and if he still has them and at what cost
otherwise you still don't have a source for the barrel
it's hard enough just to find a complete barrel and breech block at what time you could get them from Canada but they got screw up by a US seller and now out of business altogether
https://www.lothar-walther.com/gun-barrel-blanks/airgun-barrels/
Found this place. I have a gunsmith that could do the machine work on a blank
