A hold adjustment device between fore-end iron and action body in a break-open firearm comprising at least one barrel (13) mobile by rotation about a fixed hinging point (15) arranged on an action body (14) between an aligned closed position and a disengaged position rotated open with respect to the action body (14), a tenon (18) fixed at the bottom to the at least one barrel (13) for hooking with a fore-end iron (16), comprising a block (21), or cursor, axially mobile with respect to the fore-end iron (16) and suitable for interfering with the tenon (18), an adjustment pin (26) carrying on its stem-shaped portion (27) a plurality of ring-shaped springs (28), as well as a rear axial binding (30), in which the elastic adjustment device of the fore-end iron-action body hold (20) is suitable for giving a suitable hold and/or the recovery of the loss of hold due to the wear of the fore-end iron-action body coupling.