Check the barrel and receiver
It will be marked on the barrel.
Marked on the barrel where it is made.
Leave this to a qualified gun smith.
It should be stamped on the barrel
Try the Browning customer service dept at link below
26"
Allows for adjustment of barrel harmonics.
The Browning 2007 Product Catalog states that the A-Boltchambered for 25WSSM with a 22" barrel has a 1 in 10" rate of twist.
Impossible to answer without knowing the caliber.
You will have to contact an authorized Browning Repair facility
On the bottom of the barrel, next to the forearm.