How do you remove a plug from an Ithaca model 51 autoloader shotgun?

To remove the plug from an Ithaca Model 51 autoloader shotgun, first ensure the firearm is unloaded and pointed in a safe direction. Disassemble the shotgun by removing the barrel and then locate the plug, which is housed in the magazine tube. Use a flathead screwdriver to unscrew the retaining screw if present, then carefully pull the plug out of the magazine tube. Reassemble the shotgun once the plug is removed, ensuring all parts are secure.