This is a 3x magnifier scope made for use with holographic sights, aimpoint type scopes etc. It has a 3x zoom to enhance the aiming capabilities of your selected optic. The scope has a twist mount which all you have to do is twist the scope off to quickly detach the scope. The scope’s mount is still attached to the rail so you can easily reattach the scope. A fantastic choice if you want both long and short range optics on the one weapon.