Firearms that pull back the carrier using a charging handle and carriers and charging handles for firearms. In various embodiments, the charging handle engages the carrier at a gas key or tab thereon. In some embodiments, the charging handle has a bridge or engagement face located between a rearward end and a forward end of the charging handle. In particular embodiments, the bridge extends from a left wall to a right wall of the charging handle. In some embodiments, the bridge, the left wall, the right wall, and a top wall are all one piece and a stem of the charging handle has an open bottom between the left and right walls. In various embodiments, the bridge does not extend below the left or right wall, the tab on the gas key extends upward between the left and right walls to engage the bridge on the charging handle, or both.