The K6s Fiber Optic Sight system combines our high visibility fiber optic front sight with our low profile rear sight. This sight combination provides the user with an ultra-high contrast sight picture ideal for rapid sight acquisition. The low profile configuration places the rear sight in line with the frame which greatly reduces the potential for snagging, and are an exceptional choice for concealed carry and target purposes. Compatible will all K6s models, the rear sight is windage adjustable with a set screw lock and the front sight requires drilling and pinning. Not compatible with K6xs. *Minor Gunsmithing / Drilling is Required 4000153