Impossible to answer since you don't provide the type of action (OU, SxS, Pump, Semi-Auto)
If you do not have a manual, you need to visit a gunsmith.
IIRC, you can request a manual from Browning at Browning.com
Burn it!
Best left to a gunsmith
Best left to a trained gunsmith.
Check the receiver and barrel
Request a manual from Browning or ask a gunsmith for help
Seperate it into smaller pieces
Best left to a gunsmith
Should be the same as Winchester 1400 shotgun. Email me for a copy of the manual.
To determine the age of a Browning shotgun with the serial number 87590, you would need to reference Browning's serialization records or a specific age lookup chart. Browning shotguns, particularly those made in the early to mid-20th century, often have their production dates documented in such resources. If you can provide the specific model, it could also help narrow down the manufacturing date.
Browning will send you a manual for free if you contact them