The XDm's fit the XD Serpa's but many are a little loose (very little but has a slight rattle). Guys have been fixing that by adding loop side velcro or moleskin inside the holster in certain spots.
In all my checking the Serpa's are the same length so you don't need to worry about barrel length. If it's long, it will stick out the bottom, short won't use up all the space for the barrel. I liked ta2dave76's sbh. Good idea for cc.
Edit: Also, they fit for all calibers. And the compact models fit too since the grip is just shorter I believe.
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