They are the same, people have been putting TruGlo TFOs for the regular XD on the "M" since it came out, there's another forum that's full of them.
Heinie also lists both as being the same.
can anyone with a xd and a xd(m) and a a set of calipers tell me whether or not the sights for the new M's use the same cuts?
Thanks. The TFO are what i want when i get enough saved for my M