A shotgun typically stores 5 rounds in its magazine. In some countries, when hunting certain types of game, you are only allowed 3 rounds in your magazine. The "plug" therfore goes into the magazine and takes up the space that two rounds would occupy., reducing the shotgun's magazine capacity be 2 and making it legal.
Thus removing the plug restores the shotgun's capacity for a full magazine.
Do not remove any electrical plug by grabbing the wire. This weakens the connection at the plug. ALWAYS grab the plug itself when removing it.
To remove the plug from a Winchester Ranger shotgun, first ensure the shotgun is unloaded and pointed in a safe direction. Then, locate the plug inside the magazine tube, usually accessible by unscrewing the end cap or the magazine cap. Once the cap is removed, you can slide the plug out from the magazine tube. Reassemble the shotgun by securely replacing the cap.
Wooden dowel
of course !
If there is only one plug, try removing the plug, spraying WD40 in the plug hole, replace the plug and try starting.
Best left to a gunsmith
While hunting, yes. Otherwise, no.
Sparks plugs are replaced by disconnecting the battery, removing the spark plug cable and boot, and by removing the old spark plug. Next put in the new spark plug, attach the boot and cable and reconnect the battery.
Gun is restricted to 3 rounds by design. It has no mag plug, that is where the gas system is.
If you are referring to the magazine tube plug. The answer would be No. It is put there for bird hunting regulations only.
removing the breech plug
Best to ask a gunsmith for help.