A telescopic sight mounting system, comprising - a casing , which is fixable to a Picatinny rail by a channel on the underside of the casing being fastenable to the Picatinny rail and on one side of which a recess is introduced crosswise to the channel, - a casing ledge , which is disposed on one side of the channel on the underside of the casing , - a flank , which is movable forward and backward in the recess, the recess being disposed crosswise to the channel on the underside of the casing , in the direction of the casing ledge , - a locking screw , which has an end equipped with a thread and another head-shaped end and which extends first through the flank and then through the casing , the end equipped with a thread protruding from the casing , - a locking lever having a bore of the locking lever for being connected to the head-shaped end of the locking screw by means of a pin and having a surface of the locking lever and having a lateral face of the locking lever , the lateral face and the surface being disposed in such a manner that the lateral face is abuttable against the flank for unlocking the locking lever and the surface is abuttable against the flank for locking the locking lever , and the distance of the bore of the locking lever to the surface of the locking lever is larger than the distance to the lateral face of the locking lever , - an adjusting nut which is fixable to the end of the locking screw protruding from the casing and being equipped with a thread, characterised in that the pin extends longitudinally to the channel through the bore of the locking lever and through a bore of the locking screw at the head-shaped end, and in that at least one recess is available on the outer circumference of the adjusting nut , a ball being able to at least partially engage in the recess, the ball being disposed in the casing between the outer circumference of the adjusting nut and an adjusting screw , and a force being able to be applied to the ball for securing the ball by means of the adjusting screw . - a casing , which is fixable to a Picatinny rail by a channel on the underside of the casing being fastenable to the Picatinny rail and on one side of which a recess is introduced crosswise to the channel, - a casing ledge , which is disposed on one side of the channel on the underside of the casing , - a flank , which is movable forward and backward in the recess, the recess being disposed crosswise to the channel on the underside of the casing , in the direction of the casing ledge , - a locking screw , which has an end equipped with a thread and another head-shaped end and which extends first through the flank and then through the casing , the end equipped with a thread protruding from the casing , - a locking lever having a bore of the locking lever for being connected to the head-shaped end of the locking screw by means of a pin and having a surface of the locking lever and having a lateral face of the locking lever , the lateral face and the surface being disposed in such a manner that the lateral face is abuttable against the flank for unlocking the locking lever and the surface is abuttable against the flank for locking the locking lever , and the distance of the bore of the locking lever to the surface of the locking lever is larger than the distance to the lateral face of the locking lever , - an adjusting nut which is fixable to the end of the locking screw protruding from the casing and being equipped with a thread, <EOS>