Bolt receiving striker

The structure (8) has an outer part fastenable at a door frame (6). A close lath (7) and a pot-shaped inner part are movable arranged in the outer part into which a latch (5) of a door lock (2-4) is engaged in closed and/or locked condition of a door (1). The inner part is held in a basic position by using a one-piece spring unit i.e. pressure spring. The inner part is movable along closure direction of the door against spring force of the spring unit from the spring unit, so that the basic position of the inner part is more variable with a positioning device. Independent claims are also included for the following: (1) a closure part for a door lock (2) a closure system.