I had a Dan Wesson similar to that. It was a .357, blued, and had the interchangeable barrels. I had the 4" and the longest one, I think was an 8 3/4". All the tools were there to make the swap even while at the range. While S&W is nice in having the release for the cylinder near your thumb if shooting right handed, The Dan Wesson has the release in front of the cylinder, farther from the grip. It takes two hands to release the cylinder on it. But, the advantage is when it's been fired many, many times, and starts to loosen up. The S&W will start shaving lead from loose alignment, while the Dan Wesson is latched holding the cylinder more aligned and in place.... even if it loosens up over time.
That was what I was told by the Gun smith/shop that I first took it to. I've only sold 3 guns in my lifetime. Two of them, I wish I could get back. My Dan Wesson is one of them.