Take the cap off and point the gun doun and shake it and it should come out mine did
You can request an owner's manual for free at the Remington website.
Standard 16 gauge shotgun shells.
Unscrew cap from end of plug chamber .Take your barrel off there will be a little tin cap at the end of your plug barrel take it out to get to your plug
Take it to a gunsmith.
Take it to a qualified gunsmith
How many cartridge does a 12 gauge shotgun carry.
Take it to a gun smith.
Read the owner's manual or have a gunsmith do it.
You take it to a gunsmith
You can request an owner's manual for free at the Remington website.
To determine exact value of a 1904 Marlin 12 gauge pump shotgun, you would actually have to take a number of factors into consideration. The main thing to consider would be the condition of the shotgun.
Gun is restricted to 3 rounds by design. It has no mag plug, that is where the gas system is.