Again, as in many threads here, beautiful guns and photography.
Here's my M15-4 bought off gunbroker.com on Xmas Eve 2010.
Before the purchase I kept thinking, "Why a M15 when I have a M19?".
But they are not the same. Perhaps it is the same thing with a .41 Magnum and a .44 Magnum.
The "why" cannot be answered. It is a "must have".