Readily available from Browning.
Try Browning or egunparts
No
You can start your search at browning themselves,if you have no luck you may want to go to numrich gun parts corp.
Try Midwest Gun Works or e-gunparts.com
Try the gun broker auctions in the parts catagory Gunbroker.com
Rings, extractor/ejector, firing pin. forearm
Try e-gunparts.com
On line, want ad, for sale ad, gunshop, gun show, pawn shop.
Try the links below
The receiver is the largest metal piece of the shotgun, in other words, the frame of the shotgun. All the other parts, such as barrel, stock, bolt, etc- attach to the receiver. With modern firearms, the receiver will be marked with the serial number. Legally, the receiver IS the firearm- all other parts are simply parts.
Check the attached link and look up obsolete gun parts with Browning. Your gun was made in 1955
Find a good gun shop or gun smith.