If you like the smaller Leupold for the XD and other types of "stock" pistol, take a look at the C-More STS or RTS. It is smaller, the slide can be milled or dovetailed for the sight and instead of having to remove the sight to replace the battery, it has a little door on the passenger side. I use them on my open shotguns and as my secondary sight for open rifle and it beats having to rezero after the battery dies. This is a first rate small sight.