Utilizing a dot-over-dot configuration, AMERIGLO i-Dot night sights are an excellent design for all shooters. The i-Dot sights provide a quick and easy vertical sight alignment. Features : Simple, dot over dot design allows for quick and easy sight alignment Best for all around use For GLOCK Gen5 9/40 Firearms GLOCK is a registered trademark of GLOCK Inc. 3CR Tactical is not affiliated with, endorsed by, or sponsored by GLOCK Inc. Any reference to GLOCK products is for identification and compatibility purposes only.