It varies by condition, length and choke. Try the barrel exchange. Most of their B2000 barrels are around $300. Keep shoping online at the gunbroker and other gun parts outlets. http://www.barrelexchange.com/
You will have to ask Browning.
About $300-$400 depending on condition and barrel configuration.
100-2000 USD or more depending on specifics
50-500 USD depending on model
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.
50-5000 uSD
100-600 usd
50- 2000 usd
You need a trained Browning gunsmith
Contact Browning.
No
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.