IT'S MAGIC!!Although believe it or not, I gave it a good though and decided that a regular trigger would be super awkward to use, so the trigger is actually probably a little button thingy you have to push, built inside the guard so it doesn't go off accidentally while waving the thing around. I think that's how it works on some modern rifle-mounted grenade launchers.Now don't ask me how THAT would work inside the bloody thing.