Firearm with a device for disassembly

A firearm, comprising:

• a slide having a barrel;
• a receiver coupled to the slide, including
• a trigger mechanism;
• at least one guide rail engaged with the slide;
• a slide stop device configured to retain the coupled slide in a rearward position on the receiver;
• a retaining spring;
• and
• a firing pin mechanism connected to and configured to cooperate with the trigger mechanism;
• wherein the firearm further comprises a disassembling lever rotatable in the receiver about an axis of rotation extending transversely to the direction of the barrel, where the disassembling lever is rotatable between a first end position and a second end position;
• wherein when the disassembling lever is in the first end position:
• an abutment of the slide abuts against a rear edge of the disassembling lever as the slide moves forward under the action of the retaining spring and cannot be moved further forward;
• independently of said abutment of the slide against the disassembling lever, a rear side of a magazine fully inserted into the receiver is in contact with a front edge of the disassembling lever and prevents any rotation by the disassembling lever;
• independently of said contact of the magazine with the disassembling lever, an upper edge or surface of the disassembling lever is parallel with and adjacent to a lower edge of the slide such that contact between the slide and the disassembling lever prevents any rotation by the disassembling lever;
• and
• when the magazine is completely or partially withdrawn from the receiver and the slide is stopped by the slide stop device, the disassembling lever can be rotated into said second end position, with the result that once the trigger mechanism has been disengaged from the firing pin mechanism and the slide stop device has been cleared, the slide can be removed from the receiver either forwardly or forwardly and upwardly.