only when you shoot it!
with a torch
Do you have the pump shotgun or the lever-action rifle?
Yes, you can remove the barrel of a model 66 Shotgun!
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.
with a hacksaw
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"
Who made it? Is it a shotgun, rifle or handgun?
This is best left to a gunsmith.
Remove is a verb as it is an 'Action' word.
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.