Herp, I'm so cool because I own an instrument of death I could easily or accidentally kill my friends with.
yes, because guns kill people. Just like your pencil causes spelling errors. You can only "accidentally" kill your friends if your absolutely handicapped. If you treat the weapon with respect and shoot it in a safe and approved environment following proper gun safety rules then nothing will go wrong.
As for guns I own I currently own one firearm. A Mauser 48

I own almost everything here. Except my bayonet is a different style (might not be original to the gun, I'm not entirely sure). Other than that I own everything in this picture
Other than this I own a couple paintball markers, that's it.