You must call Browning with the serial number.
What is it you are asking?
Contact Browning at their website or call them.
Browning did not offer one, but you may find an aftermarket Hastings barrel (www.hastingsbarrels.com) that will do the trick.
Please re-ask. What is your question?
200 USD or so
About $300-$400 depending on condition and barrel configuration.
Browning.com has a sn function under customer service.
30 inches.
100-2000 USD or more depending on specifics
500 or so
You will have to contact Browning to find out. If you are referring to the run of Browning model 71's that were made between the mid to late 80's and early 90's, there were a total of 14,000 made. 4,000 Standard Rifles with a 24 inch barrel. 4,000 Standard Carbines with a 20 inch barrel. 3,000 High Grade (Deluxe) Rifles with a 24 inch barrel. 3,000 High Grade (Deluxe) Carbines with a 20 inch barrel.
$350-$450 depending on condition