Please use the link below to see the operations manual for the BAR. Disassembly instruction are there. Recommend downloading catalog if you have one of these rifles.
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1975
Browning.com has manuals you can request or download
Up to 1000 USD
100-1000 and up depending on specifics
Impossible to value with only a serial number.
SN were not required before 1968
50-5000 USD or more depending on specifics.
0-500 USD depending on condition.
The Browning. No Contest there.
You will have to call Browning.
You will have to call Browning.