Best left to a trained gunsmith.
Please go to the link below which is the Browning BAR Owners Manual. Disassembly instuctions can be found. The photos are most helpful. The Download is free and recommended if you own a BAR.
Sure?
belgium browning bar II safari edition 30-06
The rifle is probably a BAR
Made in 1982.
Browning's website has sn data under customer service
Best to ask a gunsmith for assistance.
Made in 1975
You must provide the serial number or call Browning with it.
100-3000 usd
500 USD
Your browning BAR which was made in 1971 will bring between 500-650 dollars.