Springfield M1903. This rifle was often used by American soldiers mainly in World War I and World War II.

A bolt action gun has a breech (back part of the barrel) that is opened and closed by hand with a small handle. They can only be fired once before the breech must be opened for a new round to enter the chamber, where it can then be fired from. Many older sniper rifles, as well as many hunting rifles today, work in this way.