Great little RDS for an AR15 or the like. It is like-new-in-box with all point of sale stuff. Has been used on a carbine. It's like an aimpoint Micro. The mount is compatible with aimpoint mounting options. Takes one AAA battery. I replaced the O ring with a Surefire O ring,(battery compartment,) if that matters, it's h2o safeI do not check my inbox or notifications on NW firearms often enough. Please call me or text me at 5418700727
