Flip-up, windage adjustable, express-style sights clamp securely into the pre-contoured base so they won't shoot loose, even under heavy recoil. Blank leaves require trimming to correct height. Easy drill and tap installation, or silver solder onto barrel. P2 two leaf sight. Mfg: Necg SPECS: Steel, blued, polished finish. 3-1/16" (8cm) long. ¼" (6.3mm) wide. 2.6 oz. (774g) weight. Fits barrel diameters:L .730" to .830"