I was at the local shop last week and saw and held a Ruger Vaquero
chambered in 40 S&W ,, was nib in polished stainless..
The owner told me that these were a special production gun and they are not listed in Rugers catalog.. They were made for a major state law enforcement organization as parade dress weapons.. and the overrun productions were sold to the public thru select dealers..
The only thing different i saw was that the cyl was bored to headspace the rounds...
No this one was not for sale ,, but was told that one pops up on the auction sites every now and then ,, and dew to the caliber worth buying
..