You can get some basic information about whatever weapon(s) you're using, along with the source for the sounds, in the 'Info.txt' document, although the info contained is only really useful if you already have a bit of existing firearms knowledge, so I still recommend doing your own research. Or at least try to avoid the Hollywood bottomless magazines trope. Try to research the weapon you're using and find out how it works on a basic level and use that information in your animation.