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Glenfield,which was made by Marlin Firearms Company made a bolt action .410ga shotgun from 1956-1965.This was the marlin model 59 which is the same shotgun as your Glenfield model 60.
Go to Cheaperthandirt.com
Open the bolt, pull it to the rear, hold the trigger back and remove the bolt. sales@countrygunsmith.net
Open bolt, elevate barrel, pull trigger , catch bolt before it hits the ground
Bolt Action 12 gauge mod 50.You can get one in geat condition for about $80 to $100.
Your serial number indicates that your Glenfield model 20 bolt action was made in the year 1980.
write to marlin with any and all writngs/markings on reciever/barrel and serial numbers
A utility bolt action 12 gauge will bring from $50 to $125, depending on condition, at most auctions.
$100
take out the scew on the bottom side of the barrel
1932-1957
make sure it is completely empty of ammo.. open chamber with bolt. hold trigger and pull bolt out the back.