7/16" Grip Frame
The following Hogue Cowboy Action grips will fit Ruger Flat-Top Blackhawk, Pre 1963 Single Six, New Vaquero and SASS Vaquero models. These models are sometimes referred to as having XR3 grip frames. These frames have a width of approximately 7/16" across the backstrap. These Cowboy Action grips will fit models with or without the internal locking mechanisms.