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Understand the mechanics of the ammunition, they are all basically the same . Some type of device has to strike them to set off an ignition from some type of primer that ignites the gun powder, expands and forces the projectile to go in the path of least resistance.
If u find one, whatever, you want to stop this from occurring:
Remove the bullets from the chamber, magazine, cylinder, what have you.
If you are having to tangle with someone who has a gun and you dont, you want to stop their gun from going boom. , you can do this by interupting the pull of a trigger, blocking a hammer from striking a primer (this is a matrix type of move where u pretty much sacrifice your thumb skin or whatever to have the hammer snap on you instead of the bullet)
Different guns eject magazines differently, but it is usually a button or a lever
Even if you eject a mag, there could still be one in the chamber, check it
Thats all i got for now