Both Doublestar's DSC Flip-Up Rear Sight DS401 and DSC Flip-Up Front Sight DS412 have traction checkering for rapid deployment and can be brought into position with one hand. These compact, lightweight sights are CNC machined from aircraft-grade aluminum billet with a flat black hard coat anodized finish. The rear sight locks securely in place and windage can be adjusted with an A1 sight tool or the tip of a bullet. The mini front sight installs easily on a railed gas block and positions the sight post at the same height as a factory fixed sight. Elevation can be adjusted with a standard A2 sight tool. Not for use on a railed handguard.