Blackhawk 7/16" Frame
The following Hogue Cowboy Action grips will fit Ruger
Flat-Top Blackhawk, Pre 1963 Single Six, New Vaquero and SAS 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.