The RMR Micro Red Dot is a small yet very effective red dot sight. It can be mounted and used on both rifles and handguns. It is adjusted using two set screws, which are attached on the side and on the back. A CR2032 is used in the base of the optics to operate the red dot sight. For assembly, the RMR has a small Picatinny rail assembly and can simply be screwed on.