Yes, it's a S&W 9mm cylinder for a 65-5 K-frame revolver. Rechambered by TK Custom. Came off my Ladysmith. Fits any 65-5, 66-6, 19-5, etc., with a 1.62" cylinder. Take .357, 38 Special, and 9mm with moonclips, to the range for the same session. All the rounds will chamber.
TK Custom. Get a look at their website. They charge $350 for this service. I'm selling the machined cylinder with moonclips. I've installed three of these in my S&W revolvers. I just completed the Model 19-7 in the photos ( not included). I put a blued cylinder in the Model 19-7 but the stainless cylinder fit right in.
This is drop-in ready for 3" and longer revolvers. The extractor rod will need to be changed for snub nose guns. Shooting 9mm through K-frame revolvers is easy on the hands and your wallet.
Call me if you have any fitment or performance questions. I'm located in the Vero Beach area at 508-477-4139.