TRUGLO TFO Hangun Sight Set - H&K Green/Yellow Rear The ultimate handgun sight. Uses our patented TFO technology. Unbelievable transition through all light conditions. Glows in the dark. CNC-machined steel construction. Concealed fiber cannot be seen by target. Fits standard holsters. Snag-resistant design. Rear sight available in green or yellow. (Please note that yellow is intended to appear less bright than green.) Fits the following models: H&K USP (excluding USP Compact and Tactical