WARNING! INSTALL IN ACCORDANCE WITH THE INSTALLATION INSTRUCTIONS.ONLY INSTALL ON COMPATIBLE MODELS. CANiK O.E.M. (SPARE) PARTS MUST BE INSTALLED BY A COMPETENT QUALIFIED GUNSMITH WITH AN UNDERSTANDING OF THE FIREARM PLATFORM THAT THE PART IS BEING INSTALLED ON. ONLY COMPATIBLE WITH INCH 1/2-28 RH THREADED BARRELS.