New Gen Model 4/15 Complete Match-grade Rear Sight with Windage/Elevation Adjustment and Integral Picatinny Mounting Deck Integral Picatinny mounting deck to fit all flat tops Equipped with locking retention thumb nut Precision windage and elevation adjustments Dual aiming apertures for all shooting requirements Synchronize iron sight with tactical dot/reticle Dramatically improves sight pictures and enhances shooting accuracy