Pull-out guide for a sliding element, in particular a drawer, shelf or drawer frame, comprising - a body rail configured to be attached to a body, - a pull-out rail, configured to be attached to a sliding element, which is displaceably guided relative to the body rail and has a, in the assembly position, upper rail leg, the upper side of which forms a support for the sliding element, and - a front adapter, which is attached to a, in the pull-out direction of the pull-out rail, front end of the pull-out rail and has a locking projection which, in a starting position, projects upwards through a recess in the upper rail leg over the upper side and, from the starting position, can be deflected downwards against the action of a restoring force into a position flush with the upper side, wherein the locking projection is mounted to be exclusively linearly deflectable in a direction at right angles to the upper side of the upper rail leg, characterized in that the locking projection is arranged on the upper side of a web center of a spring web of the front adapter, which spring web can be elastically deflected linearly downwards and is arranged below the upper rail leg and parallel to the upper rail leg and is recessed in the front adapter by means of two recesses which are arranged on both sides of the spring web, or the locking projection is arranged off-center on the upper side of a spring web of the front adapter, which spring web can be elastically deflected linearly downwards and is arranged below the upper rail leg and parallel to the upper rail leg and is recessed in the front adapter by means of two recesses which are arranged on both sides of the spring web, wherein the spring web on the web side which is shorter with respect to the locking projection has a reduced cross-section relative to the longer web side. - a body rail configured to be attached to a body, - a pull-out rail, configured to be attached to a sliding element, which is displaceably guided relative to the body rail and has a, in the assembly position, upper rail leg, the upper side of which forms a support for the sliding element, and - a front adapter, which is attached to a, in the pull-out direction of the pull-out rail, front end of the pull-out rail and has a locking projection which, in a starting position, projects upwards through a recess in the upper rail leg over the upper side and, from the starting position, can be deflected downwards against the action of a restoring force into a position flush with the upper side, wherein the locking projection is mounted to be exclusively linearly deflectable in a direction at right angles to the upper side of the upper rail leg, characterized in that the locking projection is arranged on the upper side of a web center of a spring web of the front adapter, which spring web can be elastically deflected linearly downwards and is arranged below the upper rail leg and parallel to the upper rail leg and is recessed in the front adapter by means of two recesses which are arranged on both sides of the spring web, or the locking projection is arranged off-center on the upper side of a spring web of the front adapter, which spring web can be elastically deflected linearly downwards and is arranged below the upper rail leg and parallel to the upper rail leg and is recessed in the front adapter by means of two recesses which are arranged on both sides of the spring web, wherein the spring web on the web side which is shorter with respect to the locking projection has a reduced cross-section relative to the longer web side.