I have a new bi tone XDs 9mm and I am having trouble getting the slide lock to engage. When I first got the pistol home I could not even get it to lock back at all except with an emty mag in it. I cleaned up the lock abit and it got better to where i can most of the time get it to lock back, but it still isnt right. Is anyone else having this problem? I have a XD40 Sub compact and it works great. I have checked my friends XDs 45 and it works great. I put his slide on my frame and it works like it should, but my slide on his frame is a no go, not even alittle. Ideas guys? Thanks in advance.