Just looked at a friends boito 12 ga...the front wood forearm (attached to the barrels) needs to be pulled off first, like most double barrel's do. Then slide the lever to break open the breach....
If you do not have the owner's manual, I would suggest getting one. You can call Browning or check on their website about downloading one. Alternatively, I would suggest finding a good gunsmith and...
Depending on grade of blueing and condition of scrollwork and foregrip/stock checkering, your looking at about 75 to 120 dollars. Most Boito shotguns of the era were a joint venture between Boito and...