eli5: How does a gun backfire? isn’t there any mechanism in place to prevent it from happening?

Question

eli5: How does a gun backfire? isn’t there any mechanism in place to prevent it from happening?

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Answer 1

“for every reaction there’s an equal opposite reaction” meaning that when the bullet travels at those high speeds u are also getting the shock from it in the opposite directions, in theory u could say u are “getting a gun shot” also most of the times u still have gunpowder in the cannon and with the heat and/or speed of the bullet these can sometimes ignites making a second explotions inside the cannon.