The firearm comprises a firearm frame, a barrel sleeve mounted in a rotatable manner on the firearm frame, and at least one rotation pin which extends between the firearm frame and the barrel sleeve to guide the sleeve around a rotation axis. The rotation pin and the firearm frame, or said pin and the barrel sleeve, lie in abutment with each other by means of complementary sliding surfaces, at least one sliding surface being borne by a wear component connected in a releasable manner to the rotation pin, to the firearm frame and/or to the barrel sleeve. The invention also relates to a kit for a firearm.