The rear sight 590 is manufactured with Gehman quality at the most affordable price. The Short Mounting rail allows for maximum sight movement in use with all lengths of iris attachments. It has a large elevation and windage knobs for easy adjustment even in the cold. Very short base with strong double base clamps and stainless steel clamp screws suitable for all types of rifles. – easy adjustment- best quality with affordable price Contact us at 70822-33324, if the product is in pre-order status.