For the light machine gun role, the PK is used as the standard squad automatic weapon of the Russian Army. The PK uses a 100-round non-disintegrating belt contained in a metal box made from an aluminum frame and steel cover that can be attached under the gun's receiver. The 100-round belt "assault" box has a folding lid in its cover for feeding the ammunition belt when the box is attached under the machine gun receiver and weighs or for the modernized all aluminum lightweight variant. When the machine gun is fired from a bipod, the 100-round ammunition box is normally attached to the underside of the receiver.