Browning's web site has a sn search function.
The 4G prefix to your serial number indicates that your Browning auto-5 light weight shotgun was made in Belgium for Browning in the year 1964.
The serial number prefix of 4G indicates hat you have a Browning auto-5 light weight 12 gauge shotgun that was made in the year 1964.
You will need to include the letter or number and letter prefix to your serial number in this question to get a date of manufacture for your browning light weight 12 gauge shotgun.
Your serial number indicates that your Browning light twelve auto-5 shotgun was made in the year 1955.
Frame
how old is the browning shotgun with the serial number 8G 12882
Browning.com has a sn search function you can use.
If you are asking about a Browning Auto-5 shotgun,then it was made in the year 1923,with the serial number that you have provided.
You must call Browning.
Good shotgun
50-500 usd
Readily available from Browning.