Abstract: The invention concerns a holster which has a weapon part (10) for a weapon which is detachably connected to a fastening part (1), whereby the fastening part (1) has at least one connection device (21, 21?) and the weapon part (10) having a connection counter device (23) that acts in combination with it. The invention is characterized by an adapter (12) being detachably providable between the weapon part (10) and the fastening part (1), said adapter (12) having in the area of one of its ends a connection counter device (24) which corresponds geometrically to the connection counter device (23) of the weapon part (10) and having in the area of its other end a connection device (22) which corresponds geometrically to the connection device (21, 21?) of the fastening part (1).

Abstract: The invention concerns a marking for the barrel of a firearm, in particular of a pistol, a rifle, or a carbine, with a barrel cross section the perimeter of which alternately consists of linear, polygonal segments and arched segments, where necessary with transitions between them, whereby the linear, polygonal segments define an inscribed circle, further comprising at least two ribs being provided in or on the arched segments which extend radially inward.