Best to ask a gunsmith for assistance.
There is no such weapon made by Browning. Browning does make a semi-auto of the BAR in 30-06. You can download or request a manual from the Browning web site.
Your browning auto-5 shotgun was made by FN of belguim for browning in 1957.
if you are asking about a browning auto-5 shotgun?The year of production of your browning shotgun is 1928.
Being that you said auto shotgun,then you have the Browning auto-5 shotgun that was made by FN in Belgium from 1903-1975.Your serial number indicates that your Shotgun was made in the year 1938.
your browning auto-5 was made in 1925.
In order to answer your question I would need to know if your shotgun is a auto-5,browning pump shotgun(BPS) or a over-under(CItori or superposed)to give you a accurate answer?
I would have to assume that you have a semi-auto shotgun.If your shotgun has a slight hump to the back of the reciever then it was a shotgun made with a browning patent and would have to be listed on the gun along with the royaltys paid to his patent.
If your browning auto-5 shotgun is a 12gauge,then it was made in 1927.If you have a 16 gauge shotgun then it was made in 1934.
Depending on condition,your browning auto-5 shotgun is valued at between 425-725 dollars.
your browning model auto-5 shotgun is valued at between 375-650 dollars.
Browning will send you a manual if you contact them.