warmachine
Marksman
Check out these sites for replacement parts/upgrades:
Welcome to Springer Precision LLC - The XD/XDM Specialists
PRP~ XD & XDM Perfection!
XDGuys.com
PISTOLGEAR |Springfield XD XDm Parts, Accessories, Magazines, Sights in stock
And if I'm ever at a shoot where you attend, you can try out my XDm in foh tay
I have to agree with this list except XDguys.com I am on XDtalk and they were one of the sponsors there until they started dropping the ball on almost all their orders. People were/are having a lot of communication issues regarding returns, order status, and shipping times.