If you are looking for an original manual for the gun, try ebay. They come up for auction all the time on ebay. Below is the link for an auto-5manual online that Browning provides.
You must call Browning to find out.
You will have to call Browning an provide them with the sn to find out.
You will have to contact Browning and request a owner's manual or find a good gunsmith
left side of barrel usually
the manuals are available on the Browning site in .pdf format
Will be hard to find, and expensive. Do an internet search for Corson's Barrels.
Which model? Use the link below to find the manual of your particular model
Your Browning auto-5 sweet sixteen shotgun with the serial number of S-36040 was made by FN in Belgium in the year 1955.I hope that you find this info of help.
You will have to call Browning to find out.
Provide a detailed description of ALL markings
With the serial number S45226 that you provided,I can say that your Browning sweet Sixteen model auto-5 shotgun was made by FN in Belgium during the year 1955.The serial number range for 1955 was S24851-S49350.I hope that you find this info helpful.
Contact Browning.