I am aware of the issue of the locking blocks cracking on some xd's. I am also aware that the service models have the radiused corners to remedy the problem but the sub compacts do not. That being said, I have a service and a sc both in .40 and my service (which is older than my sub) does have the radiused corners. When doing a search here on the site, I don't see mention of anyone's locking blocks cracking recently, so it seems the radiused corners fixed the issue but I'm a little concerned about my sub developing cracks in the future. Since it is my EDC I am looking for ultimate reliability. I read somewhere on the net, sorry I can't remember where, the the reason the subs do not have the radiused corners is because they did not suffer from this issue but I also have seen some members of this site with cracks in the locking blocks on their subs. My question is how common of a problem is this with the subs? Should I be concerned at all or is it very rare? I know I am going to hear "Springfield will take care of it if it breaks", and I know that's true but just trying to be proactive. I hate to be without my EDC! Thanks in advance for any help!