Picking up a Pistol will give you 10 bullets. Picking up either a Submachine Gun or Heavy Machine Gun will give you 24 bullets. Smaller bullets will give you 12 additional. Larger bullets will give you 32.
Can be found everywhere, with the exception of Saving Juanita (excluding PS2) and Saving Claude. Respawns indefinitely in the 31st Century Fox room in Space Station Meer and the Viggo Industries Harrier MK III balconies in H.M.S. Viggolina.