Actually they all have the Tamer Grip. The SP101 & 4" are Hogue. The 6" has the Ruger version (also a Hogue I think). They do make quit a difference in the "felt" recoil.I notice the 4" revolver sports the Tamer Grip. Although I haven't tried the Tamer it appeals to me more than the regular Monogrip in appearance.