No, it's still available. They slightly changed it, though.
Browning Pump Shotgun "BPS"
No
Go to Browning's site, click on Support then date your firearm.
If you don't have a manual, request one from Browning. If you can't wait, find a good gunmsith
1977
Never heard of a model 22 BPS. A Browning BPS in 20 gauge can vary from 150-400 depending on condition.
cost
No
32 year old BPS in 12 gauge.
Among other BPS shotguns, yes.
No it does not. The Browning BPS Hunter is a shotgun. The "410" signifies the shell size (guage) in this case .410