Meprolight Glock R4E Sights Family Set Designed by special forces veterans with years of counter terrorism combat experience Three vertical and 3 horizontal alignment features that the eye automatically lines up while the operator is presenting the weapon to the target This 3X3 alignment design allows for the most rapid sight alignment of any night sights on the market Faster target acquisition, quicker sight alignment, a more refined sight picture The external construction of ML12224 were specifically engineered for the eventuality of clearing or charging the pistol during one hand operations