[Redman84]

Are there any differences in xd45 and xd45c since they came out or have they remained relatively unchanged?

 

[uponthestair]

No change until the thumb safety was added in about 2008.

I don't know if that changed any of the quality or accuracy of the pistol.

 

[xdmp22]

Not sure what Model specifically, but the XD series have had a few changes. One change was the change in the black finish to melonite, the other was the relief notches in the locking block. The older ones could crack.

Also, the older .45 mags have also been updated due to cracking on the back @ the top

 

[ajamesp51]

But the 45acp models have all had melonite so no worries there. And I wanna say that all 45acp models came with the updated locking block. I got one of the first 300 sent out as gifts before they shipped to the stores and it has the relief cuts. The day before I got back from that years Shot Show it was already at my door step.

 

[Dirty Rod]

There are a couple of threads that describe a few other changes. The ejector has changed as well and the newer barrels have a cut that helps keep the guide rod in place during reassembly.