This gun was made in 1971. Value depends on condition. A two barrel set usually adds about $300 of value for the second barrel. In a Browning case it usually adds another $300. Depending on condition The gun could go between $400 and $1500 depending, before adding the extra barrel. A professional appraisal is recommended.
It stands for barrel, but originally it stood for blue barrel, because the first mass-produced 42-gallon barrels for shipping oil were blue.
It depends on which barrel you need. Light 12 barrels are more expensive than the standard weight barrels. Is your gun a Magnum? If so, a mag barrel would be required with a 3" chamber. Having the correct barrel address to match the date of your gun is also important. All of this said, extra barrels usually run in the $150 to $400 range for most A5's.
In today's dollars (2010) it was about $50.00 per barrel. In 1978 it was about $14.95 per barrel.
1 barrel of oil = 158.987295 liters 1 barrel of oil = 42 US gallons
Extremely expensive at that time: $37.42 per barrel. (equivalent to about $99.00 per barrel in 2010dollars)
Your browning 16ga was produced by browning in belguim in 1949.
Your gun is a Standard Weight model made in 1961. The suggested retail price when new was $134.50 with a plain barrel - $154.50 with a vented rib barrel.
Although both are interchangeable, a true Sweet 16 barrel will have three holes drilled through the barrel band. This was one of the ways Browning lightened the barrel. The rib will also be a smidge thinner than on a regular barrel.
You will have to ask Browning.
You need a trained Browning gunsmith
Contact Browning.
No
There is no "Standard" choke. A5's could be purchased with one of many different chokes, however, the more common chokes on a 28" barrel were Full and Modified
It will be marked on the barrel. The barrel is marked "Made in Portugal".
It is possible
No
Marked on the barrel.