Firearm

An adjustment device (10) for a firearm (1),

• wherein said firearm (1) comprises:
• a first support portion (2) delimiting at least one first friction surface (6, 6′);
• and
• at least one barrel (4, 4′), mounted to said support portion (2) in a rotatable manner (A1) between opening and closing configurations and comprising an abutment appendix (8);
• and
• wherein said adjustment device (10) comprises:
• i) at least a second friction surface (12) configured to be placed in a sliding contact with the first friction surface (6, 6′) to oppose a resistance to the rotation of the barrel (4, 4′) between said configurations;
• ii) a contact surface (14) with the abutment appendix (8);
• iii) an adjustment member (16), movable longitudinally (L1, L2) to modify a relative distance between the second friction surface (12) and the contact surface (14), thereby adjusting the sliding friction between said friction surfaces (6, 6′, 12), and therefore said resistance;
• iv) a maneuvering element (18) rotatable in discrete adjustment positions, interacting with the adjustment member (16) to move it by a constant pitch at each angularly adjacent adjustment position.