Depends on what application it was ported for and by what process.
Ask a gunsmith for help.
your browning shotgun was made in 1963.
You should visit some of the shotgun shooter's forums such as shotgunworld.com and read the threads.
No. All current Citori, Cynergy, Maxus and Silver shotguns as well as the BAR centerfire rifle have chrome-lined chambers.From Browning customer service in response to a question on the Browning website.
No
Ask a gunsmith for help or request/downlaod a manual from Browning's site.
1970
No
It wil be marked on the barrel.
Sterling Silver Shotgun in DarkoviaForest
Shotgun Slade - 1959 Silver Queen 2-14 was released on: USA: 1961
Possilbe, but, not recommended.