Weapon accessories Mounting two-piece 30mm on 11mm rail - LOW UM1125L Two-piece LOW duralumin mounting is designed for riflescopes with a smaller objective, usually up to 50 mm. The attachment is by means of a screw on each part. This mount is suitable for mounting a riflescope or any other device with a 30mm. The mounting is designed for an 11 mm rail. View