Lyric discussion by thisisthegoodstuff 

Cover art for Gun lyrics by Soundgarden

This is from Wiki

"The song's lyrics appear to relate to the views of some Constitutionalists and Libertarians on the right to bear arms as a protective measure against tyrannical government. It has an overall theme of violent revolution. The line, "shoot shoot shoot 'til their minds are open" becomes a double entendre in this context."

interesting stance the band takes here. Keep in mind this was written in the Reagan/Bush years "the right to bear arms as a protective measure against tyrannical government" so I imagine that was a jab at the party in power during that day. Much of the meaning is probably symbolic here.