4 inches including chamber.
Best bet is to find a gunsmith
50 or so
Check Browning.com website.
No way to tell without a detailed description of all markings.
We need the model- there is more than 1 Browning .380 pistol.
Take it to a gunsmith
0 To 400.00
Take it to a gunsmith and ask for help
none
25-75 USD
Take it to a gunsmith and ask for help