Volthane Target Grips for Ruger MK IV- Featuring an aggressive no-slip diamond checkering, our new Volthane Grips for the Ruger MK IV are made from a proprietary material designed to withstand the elements as well as hold up to moisture, gun oils, and cleaners. Our unique one piece design offers an improved fit that accommodates most hand sizes. The thumbrest, heelrest, and finger grooves are all carefully designed to provide you more control of the Ruger® MK IV™ pistol. - Fitting Info: This grip has an extended magazine release button built-in. It's dimensioned to work with the Ruger factory standard magazine release button. If your MKIV came with an extended length magazine release button, you will need to replace it with a Standard Length Magazine Release Button.