Does anyone know where I can actually buy them? I've tried red store and alot of other japanese websites but I suck at searching for stuff like this. So can you please help?

sorry to tell you but... they're not made anymore :(
any site that has will probably not ship themto the us because of gun control laws. like i m gonna take a plastic model and make it into a real live working gun. this could satisfy you.
http://www.qqcosplay.com/GGV/ggvbyggun.html

Don't revive old threads.