Simply that it was a grade II. Grade I guns had a blued trigger
I don't think Browning can modify trigger pull on their rifles due to liability, but you can contact a retired Browning Gunsmith who does excellent work on pull.
Usually it stands for "Safety." When activated it keeps the trigger in a safe fire mode.
Browning Automatic Rilfe
Japan
Yes
Embellishment
Besides a number of books published on Browning, and some of the gun collector forums (google Browning collectors) you might start with Browning. They have a website, and are still in business making very nice rifles, shotguns, and pistols.
As far as I know browning did not have any firearms made for them in australia.
Depends on the specifics of the one you have.
5 lbs
Rifles can be purchased from the manufacturers such as Browning or Smith & Wesson. Rifles can also be purchased from third-party stores such as Amazon.
Browning has made centerfire lever action rifles in various calibers over the decades.