As far as I know, the XDM isn't available yet in .45, and I haven't heard anything from SA concerning if and when this will be produced. Right now your only options are the The question is whether or not you plan on using this for conceal carry. The 4" will be a little easier to conceal, but if you're a big guy, an extra inch isn't such a big deal. I have a .45 Tactical on order and plan on carrying. I presently carry the XD-9 Service, and after a few minutes I can't hardly tell it's there. If you're comfortable carrying a 5" firearm concealed, go for it. It all comes down to personal preference. Your only options at this time for an XD .45 are the 4" or 5", compact or otherwise.
If you are planning on shooting a huge amount, then I would go for the 5" hands down. I have not seen any difference in accuracy up close, but the longer sight radius seems to stand out past 25 yds. A tiny little more weight up front also makes a small difference in the follow up shot speed.
For concealed carry, the shorter barrel doesn't stick out under your jacket quite so easy.
I say get both, or in my case, all three. I have the compact, service, and compact 45. They make me smile every single time I get them out. Can't wait until tomorrow to shoot my tactical some more! Not even sure if I will bother with the 9mm.
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