They don't care, look at where the hammer hits the cylinder on hand cannons- the top chamber, like in real life. Then look at what chamber is lined up with the barrel- the bottom one.
So the hammer is hitting the top round and the bottom chamber is firing? Space magic.
English
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This is a design currently in use. I believe it's called the Rhino? It doesn't use a traditional hammer. There are internal firing mechanisms between the hammer and chamber. It's made this way to change the recoil arc.
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