I'm a pretty stereotypical left-winger. I organize anti-war walkouts and marches, I (will) vote democrat (which I suppose isn't very radical at all. I'm just excited to be able to vote. 18th birthday FTW), and I find myself identifying with a lot of anarchist/libertarian points of view.
I'm also going to be buying a gun soon. I wouldn't carry it around with me as there is nothing I carry on my person that is worth dying for. However, because I believe very much in democracy, I believe in the individual's right to own a gun. It either has to be everyone or no one; if the government has guns, I want one. If the military and the police want to give theirs up, I will give up mine. Also, as a Jew with relatives who died in the camps, you can bet that if any group, governmental or otherwise tried to take away my freedom or the freedom of anyone I love, I wouldn't sit by and let it happen. Never again.
As for bikes and guns, I'd rather give up my possessions than my life, so there is no reason for me to carry something that can kill. I'll fight someone no problem, but killing over possessions is quite possibly the number two reason for the problems this world has (number one, of course, being killing over ideas).