Have it checked over by a good gunmsith first and contact Browning. Age of the weapon can be a factor.
Bismuth was created to be used as non-toxic substitute for steel in "classic" guns for areas where lead in not allowed
As long as your gun is in good condition/working order bismuth is fine and WAY better than steel ,but WAY more expensive also
not at all
You can not use. Or should not use. The wad stays with shot exiting. I suggest improved cylinder or bore
A 12 gauge shotgun with changeable choke tubes that fires 3.5" shells.
This project should be probable.I would have a competent gunsmith give you a quote for threading the barrel to except the Invector plus choke system.
100-500
Assuming that your Belguim made Browning auto-5,20 gauge magnum shotgun is in 98% condition.Iwould assess a value of 925 dollars for this model with a vent rib barrel that was made in 1970.If the gun rates a 95% condition then 850 dollars.
Depends on how choke markings on the weapon.
Browning made choke tubes.
Browning has a web site with lots of information and a search function that will help you.
You will have to contact Browning to find out.
Contact Browning.
If it has choke tubes, yes. If it is fixed choke, no. I called Browning about mine and that was the answer they gave me.