Browning made choke tubes.
A 12 gauge shotgun with changeable choke tubes that fires 3.5" shells.
Go to Browning.com and type "Invector Choke" in the search function.
You will have to call Browning to find out.
Possible, but, not recommended.
Either Invector or Invector+ depending on how it left the factory.
The Invector, or "Standard Invector" system" was introduced in 1983. A few years later, the Invector-Plus chokes were introduced to fit the new back-bored shotgun barrels. These two choke systems will not interchange. If you have screw-in chokes in your shotgun barrel, the kind of system you have will be stamped on the barrel near the receiver. You must use the proper choke system for your shotgun.
To change the choke of the shot
Look at the choke tubes.
Best bet is to have it examined by a good gunsmith.
Try Mossberg, Weatherby and Winchester
Yes, all Browning Invector and invector plus barrels can shoot steel shot.