36 years old.
1967
1977
No serial number provided
It was made in 1965
A Browning Auto 5 Lightweight shotgun was made in 1957 with that serial number on it.
No such model number ever used by Browning.
You must call Browning with the serial number to find out.
This gun was made in 1960
Receiver
Impossible to answer without a serial number and detailed description.
1966
The letters MW in the serial number of your browning stand for the year of manufacture which was 2004.