I have a sample of one, a 629-6 6" I bought some years ago to keep from putting too many rounds through the 29-2. I'd not intended to ever have a Hillary Hole revolver, but after handling it I found the action and balance surprisingly good and plunked down the cash. I mainly use it for a knock-around, and I've not had the lock actuate over (hundreds) of rounds. I had planned to remove it, but I am just curious to see if it ever fails.