Check the receiver and barrel
Recommend you find a gunsmith and ask for assistance.
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.
Try e-gunparts.com or MidWest Gun Works
You need a trained Browning gunsmith
No
Contact Browning.
It will be marked on the barrel. The barrel is marked "Made in Portugal".
Marked on the barrel.
It is possible
No