This GP100 Front Sight is an original factory replacement part from Ruger. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation. Disassembly and assembly may be required to replace part and some parts may require installation by a qualified gunsmith. Notes: Fits adjustable rear sight models only.Does not fit GP100 Match Champion or GP100 Standard models 1715, 1757, 1761, 1752, 1753 & 1766.