Go to http://www.krausebooks.com/category/firearms_knives and purchase the Gun Digest Assembly/Disassembly book for shotguns. The Flight King is in there.
only when you shoot it!
with a torch
Do you have the pump shotgun or the lever-action rifle?
First remove the screw opposite the bolt. Operate the bolt as if you were cocking the gun, pull the trigger and it will slide out.
Yes, you can remove the barrel of a model 66 Shotgun!
To remove barrel, first disassemble gun. Remove magazine by inserting a 1/4" dia punch in the hole in the magazine and unscrew. Now the hard part. Unscrew the action from the barrel. You will need a special barrel vice and a special action wrench to do this - if you don't want to bugger up the barrel and action. The barrel vice needs to accomodate the rib (if installed). It needs to use custom made wooden jaws (for each different barrel). Use rosin on wooden jaws to increase friction. These tools are usually only economical to make if you are in the gun repair business.
with a hacksaw
You dont, you keep it on.
Close the shotgun action and insert a rod down the barrel to the standing breech (to the rear edge of the chamber or where the back of the shotgun shell would be). Mark the end of the rod protruding from the barrel. Remove the rod and measure its length. Per federal law (GCA 1934), this must be a minimum of 18"
If it is a J.C. Higgins bolt action shotgun, there is a small set screw on the left side of the receiver top between the bolt handle and the ejection port. Use a flat tip screwdriver and take out that screw. It is litterally the metal peg that the bolt is running back into. Without the screw, the bolt comes straight out the rear.
This is best left to a gunsmith.
Who made it? Is it a shotgun, rifle or handgun?