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 torch
Yes, you can remove the barrel of a model 66 Shotgun!
with a hacksaw
Who made it? Is it a shotgun, rifle or handgun?
Send it to the factory or a trained factory armorer
hire it done.
If it is a double, remove barrel and you will see it along with serial #.
you cannot remove it. it is all in one with the receiver frame
Follow the instructions in the A5 manual using the link below.
You can request a manual from Remington on their web site.
remove the magazine cap by unscrewing, then the forearm will slip off. then pull the barrel off.
take out the scew on the bottom side of the barrel