I am 14 years old, and live in the USA. I make guns and other misc stuff, like spaceships. Alot of my stuff is inspired by other great Lego gun artists, like Jack Streat (streaty121 on YouTube), and others. For some I might make instructions, but some mechs are not mine, but you could find instructions for those :P
Also, I have alot of LEGOS® (mostly minifigs and stuff) I have been making Lego® guns since about 08, but my first ones were really cruddy... But now I think alot of them have gotten WAY better!