Limited Lifetime Warranty Fits on flat top guns and acts both as a carry handle and a rear sight system. Fully adjustable rear sight with windage and elevation clicks. Can be used with a variety of scopes, lasers and lights. Exact Precision/Tolerances to Fit ALL M-16/AR-15 Variants Superior Quality Locking Plate Excellent Quality Thumb Nuts with Retention Design Long Range Rear Sight Adjustment Unmatchable Quality and Pricing