between the stock and the barrel
Check the barrel and receiver
It will be marked on the receiver/barrel.
Try the receiver, barrel, forend
Check the receiver and barrel
The Sears Ranger 105-20 16 gauge shotgun came out in the 1930s. The Sears Ranger shotgun has a 26-inch barrel.
If you have a Model 30 pump shotgun, the barrel is not intended to be removed by the user. To do so requires specialized tools such as a receiver block and a barrel wrench. You can clean and lube the shotgun with the barrel attached to the receiver. Contact Savage Arms Customer Service and get an owner's manual for your shotgun.
Look on the receiver and barrel.
It will be marked on the receiver/barrel where it was made.
CHeck the barrel and receiver.
Unable to answer as asked. Is it already a shotgun or will it be built from a virgin receiver?