Finally an M-16 Sight rail that rivals the quality of the real version. Made of aluminum, this sight rail will hold up to most anything you can throw its way. Attaches with two thumbscrews to most any 3/8" dovetail rail. It also sports a dual peep hole sighting system with windage adjustments. Chose the small aperture for long range sniping or the specially enlarged aperture for accurate CQB. Comes with a removable 3/8 inch dove tail for mounting optical sights.