Sigarms SHR970

[berettashotgun]

I've been searching far and wide for a new barrel for a SHR970 and the barrel extension is really holding me back - does anyone know of any barrels for sale?
I would love to have a 260,7mm-08,264 mag, 6.5x55 or 6.5-06 for these
Tried CDNN amongst other places, but I'd really like to know HOW the barrel extension is on the barrel; is it made as a part of the barrel or is it added on (pressed or threaded) after the barrel is chambered?
Already have both bolts, I just want a smaller caliber than the 280 I have.
The 25-06 barrel on the first one I bought is never going anywhere, but a beater in 280 would be nice to swap calibers every once in awhile.
Thanks.

 

[Afy]

The barrels for an SHR are difficult to get, difficult to swap and the gun is a PITA since it always wants to be squeaky clean. I sold mine and got a Savage which is so much easier to deal with.