Abstract: An improved reference sight mount device for use with a gun. The reference ight mount attaches to a gun tube having a mount receiving zone near the tube muzzle end. The mount includes a bracket for mounting a reference sight, and includes a band having a conformed internal diameter conforming to the receiving zone. The mount has an integral sight mounting bracket thereon and a lock for engagement with the gun tube. Three embodiments are described. In one embodiment, the mount receiving zone includes a shrink fit zone and the mount includes a conformed zone formed by a band having an internal diameter sized to expand upon heating and shrink into conformity with the mount receiving zone. In the preferred embodiment, the mount receiving zone includes a tapered press fit zone near the tube muzzle end and the band includes a tapered internal diameter press fit zone.