You can go to Browning.com and download a BAR manual.
To remove the trigger guard from an older browning bar you unscrew the butt plate from the stock. Then you need a long flat head screw driver The stock is removed from inside the stock . Once stock ios removed the trigger guard can be removed by sliding backwards. Hope this helps
A gunsmith can help you.
DO NOT ATTEMPT THIS!!!!!!!!!!!!!!!! Send it back to Browning.
You will have to take it to a gunsmith to be measured. All are different.
Leave this to a gunsmith
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.
Simply that it was a grade II. Grade I guns had a blued trigger
Best to ask a gunsmith for help.
Left hand side of receiver, above the trigger.
Best left to a good gunsmith
your browning bar was made in 1976.
BAR stands for Browning Automatic Rifle, not browning association rifle.