Not enough information to answer this question. Based on model, and condition you can get a general idea of value from the Blue Book link below. A professional appraisal is always recommended.
Depending on the condition,DOM,grade the gun could be worth from $280 to $4000 or more.
You will have to call Browning.
The suffix of M71 was assigned to the Browning model BAR(Browning semi-auto rifle) which was made in the year 1971 in Belgium for Browning.
You will have to call Browning
It has not been made yet.
what is your question?
Call Browning or check the serial number on their website if it is up.
200-2000
1970
We need the model and condition.
700-1000
Sometime in the 80s. You will have to call Browning to narrow it down further.
http://www.browning.com/customerservice/dategun