I have a Ruger BlackHawk chanbered in .41 Magnum. I have mounted a Burris 2x using a Burris mount and Redfield rings. I have also installed a SBH hammer. I now want to install a Bisley gripframe. I ave been informed (by Ruger) the entire trigger assembly from the Bisley will also need to be installed if I convert to the Bisley gripframe. How accurate is this information? Also...what aftermarket grips are available for the Bisley gripframe? Thanks to anyone that can help.