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Shell ejecting air gun?

Im making an marble air gun just like the one the teach you how to do at sentex.net and i was wondering if anyone could give drawings on how to make the marble gun eject shells? Is it possible on a home air gun? Please tell me beucause it would be really nice if i could eject shells on my homemade marble gun. And not only that but another question as well: Can i make bullets myself from melted tin?

it would be hard for air guns to eject shells which i may be impossible. But you can make bullets from melted tib but if you put them in a real gun they would melt.