Either Invector or Invector+ depending on how it left the factory.
Look at the choke tubes.
See the link below for instructions.
Go to Browning.com and you can download a manual.
Download a manual from Browning or take it to a gunsmith
Not quite sure which model you have. Use the link below to find the owners manual for your gun. Follow the manual for dissassembly.
Browning.com has manuals you can download for free.
Take out the screws?
Best left to a gunsmith
Best left to a gunsmith.
You will need the services of a gunsmith
Best left to a gunsmith