A sight mount for fire arms comprises a base part (10) to be mounted on a fire arm, and an upper part (11) to have a sight mounted thereon. The upper part is pivoted relative to the base part for movement about an axis between a first position corresponding to the operative position of the sight, wherein a projection (33) on the, upper part or the base part engages a groove (29) on the other part, and a second position transverse to the first position, wherein the projection is disengaged from the groove to allow the upper part to be separated from the base part. A latch (21) is spring biased to an engaged position preventing pivoting of the upper part, and against the spring bias can be brought into a disengaged position allowing pivoting of the upper part.