Remove the two screws from the recoil pad. There will be a long hole leading to a screw head that attaches the stock to the receiver. Turn the screw counterclockwise until loose. The receiver should slip easily apart. Simply reverse pproceedure to reattach. You'll need a standard long shank screwdriver for the stock/receiver screw and a Phillips for the recoil pad.
The receiver is completely modular and nothing will "fall apart" after the two parts are separated...
You dont, you keep it on.
only when you shoot it!
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!
with a hacksaw
To remove the magazine tube from a Charles Daly 20 gauge shotgun, first ensure the firearm is unloaded and the action is open. Locate the magazine cap at the end of the magazine tube, unscrew it counterclockwise, and then carefully slide the magazine tube out of the receiver. Depending on the model, you may need to remove additional components, such as the forend or any retaining screws, to fully detach the tube. Always refer to the specific owner's manual for detailed instructions related to your shotgun model.
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.
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.
This is best left to a gunsmith.
Who made it? Is it a shotgun, rifle or handgun?