Gehmann irises utilize diamond-cut tempered spring steel leaves captured within a metal outer ring to guarantee a perfect viewing cycle. Matte finishes are applied internally and externally to minimize light reflection throughout. Will work with most rear sights available (Centra, Warner, PNW, RPA, etc.). This rear sight iris incorporates all the features of the Model 510 but includes built in optical color filters (glass) in yellow, green, brown, light grey, dark grey, and orange. Can be used as standard iris with filters switched off or removed.
Sinclair, Issue:3B, Page:214