If it's doing it regularly, it may be an extractor problem.
Possible causes include, ammunition, magazine, spring,etc..
See a gunsmith.
It means that the shell will eject on the left side not the right. Same way with rifles.
The gun does not always cycle. It also will not always eject the shell. These can both be potentially dangerous situations.
All Bolt action rifles work the same. When you fire you have to manually operate the Bolt to eject the shell casing and load the next shot. This must be done for each shot until the rifle is empty. In the case of Air soft there is no Shell casing, but it's the same action to load and fire.
Shell-ejecting airsoft guns tend to eject their shells using a spring loaded system. once the bolt, or slide is drawn back after firing, the spring will force the spent shell out of the gun
I think that you are asking how to unload the shotgun. I don't believe that the magazine can easily be removed. You will have to "cycle the action" to empty the gun. In a safe area with the gun pointed in a safe direction, you will pull back on the lever that sticks out of the right side of the gun and eject the UNFIRED shell. Let go of the lever so that the action closes and a fresh round is chambered. Pull back on the lever again to eject the fresh round. Repeat as many times as necessary to empty the gun. Keep you finger away from the trigger (which is the small lever inside the metal circle sticking straight down).
When you fire most guns, the gun will eject the brass cartridge the holds the bullet, gun powder, and primer. The firing pin of the gun hits the primer at the base of the cartridge, which ignites the gun powder and fires the bullet. As the explosion occurs and the bullet leaves the barrel of gun, the mechanism of the gun uses the explosion's energy to eject the now empty brass cartridge.'Policing the brass' means to pick up the spent cartridges after your done firing.
That is hard to troubleshoot without seeing the gun. Try removing the foreend and dismounting the barrel from the receiver. Look at the ejector rod where it contacts the receiver and where it is pushed when the action is opened. You may well see what the problem is. You option is to take the gun to a gunsmith for inspection and/or repair.
Could be a multitude of things, from pits in the chamber to problems with the ejector mechanism. Have it checked by a gunsmith.
Many types. First, muzzle loaders do not use cartridge casings. Only autoloading firearms automatically eject a fired casing. Revolvers, and lever action, bolt action, and pump action firearms require a specific action by the shooter to eject a fired casing, as do single shot and double barreled shotguns.
With the gun pointed in a safe direction, safety ON and your finger OUTSIDE the trigger guard, press the disconnector (to the left of and to the rear of the trigger) Pull the forearm to the rear. The chambered shell should extract and eject. If there are more shells in the magazine, they will load into the chamber when the forearm is moved forward. You will need to repeat until gun is empty. Now- go contact Winchester Customer Service through their website, download and PRINT the user's manual- which gives instruction on this)