A firearm of the rotating bolt type includes a housing part made of plastic or metal, a metal bolt carrier guide, a bolt carrier that is guided by the bolt carrier guide and that has a bolt head rotatably mounted in it, and, held by the housing part, a metal barrel nut in which a barrel can be fixed and in which the bolt head can be locked. The bolt carrier guide is directly connected with the barrel nut so that it is rigid with respect to movement, at least in the longitudinal direction of the firearm.