This (if done correctly) will get you a mini volcan chain gun!loads of fun! first you must go to the garver or gant bridge (which ever one is the train bridge) and in sanfiero go to the first support of the bridge. on top of it will be a mini volcan. it is tricky to get but it is possible or i wouldn't have done it 12 times in a row. note: it doesn't have infinite ammo but put in infinite ammo cheat and it will.