The sig sauer flip up iron sights are quickly deployable, foldable and built to attach to picatinny rails.Rear aperture sizes, small: 1/16" large: 3/16th".
Type: Flip Up Front/Rear Frame Material: Polymer Frame Color: Black Firearm Fit: AR-15 Style: Flip Up Back Up Sight Set Windage Adjustment: 20 MOA Elevation Adjustment: 20 MOA Firearm Type: AR-Platform