Sig ROMEOZero R Model Fits the RMR Footprint. Carbon-Infused WeaponsGrade ultralight polymer housing provides increased shock and drop protection. Features aspherical glass lens with zero distortion; T.A.P. (Touch-Activated Programming) and button-activated brightness and reticle selection modes; 8 daylight brightness settings; structurally enhanced steel shroud for added protection and rear backup sight notch, super Luminova for low light conditions.