Was going to +1, but a quick Google found 3-inch Model 66's. I have never seen one before, and must assume they are fairly rare. Like RoboCop said, you will be able to find the 2.5 inch barrel much easier.I am not sure about the 3". Most "snub nose" 66's I have seen were 2 1/2". The 65 was available as a 3".