Guide rail assembly

Guide bar arrangement with a guide bar (6) and with a circularly driven saw chain (7)， the guide bar (6) having a guide groove (9) which runs on the outer circumference of the guide bar (6) and in which the saw chain (7) is guided， the guide groove (9) being delimited by a groove base (15) and two mutually opposite side walls (18， 19)， and the guide rail (6) having an opening for the supply of oil， which extends from an outer side (20) of the guide rail (6) running in the longitudinal direction of the guide rail (6) into the guide groove (9) and which opens into the guide groove (9) in a first side wall (18)， a Insert (17， 27， 37， 47) is fixed， which reduces the free flow cross-section of the opening， characterized in that the insert (17， 27， 37) subdivides the free flow cross section of the opening into a plurality of passage openings (28) and that the insert (37) has a wire mesh which has the passage openings.