The Kinetic Research Group Magazine Catch Extender puts control right at your fingertips. This is a popular and high quality upgrade for your Sako rifle. It replaces the factory magazine catch to improve ergonomics and ease magazine changes. Most users will now be able to actuate the magazine catch/release with only minimal movement of the firing hand. The Catch Extender is for use with the factory TRG chassis and magazines and will fit the TRG-22 and some TRG-42's. Fits: Only TRG-22/42 using factor Sako magazines Note: Does not work with AICS magazines