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The reason I think It doesn’t fire is that you need to add a low friction roof for the rounds and maybe a more reliable firing mechanism so you can shoot more reliabily
I would think of using a propulsion system that can throw the objects, not hit the bullet, if you are confused by this, watch this video --> ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-l7O1dVTMHyA.html