You could try the ulticlip with whatever holster you prefer. My wife really likes it as she doesn't wear a belt but it holds her gun/holster securely IWB.
I have had no failures to lock back besides the few when my Shield was new and my thumb was hitting the lever.... adjusted my grip and never a problem since. No excessive wear on my slide stop. not sure if you were asking me or Ballistic147.
It can be used to release the slide but was not designed for that purpose...my opinion based on the user manual and... it likely would have a larger button and be easier to disengage if that was the case. It has the serrated button on the outside to facilitate locking the slide back manually for...
My guess would be the nose profile of the hollow points are slightly bumping the slide stop as they pop up to the feed lips. try HP's with a different nose profile (more rounded maybe). Also shoot it left handed to be sure it's not your thumb doing it.
I checked mine and it does exactly the same as this. Over 1000 rnds thru it. Does not concern me at all... not easy to get it OOB to start and easily goes back forward. There are so many other things that could go wrong in close up fight. My Shield has been 100% from the start. It is something...
I had the same issue at first. My thumb was hitting it somehow. Solved after adjusting my grip. Try shooting it left handed and see if it still happens.
I have a Shield 9 nts and love it. My wife got a CCP as soon as they were available. It is a nice shooting pistol. She wanted something smaller to carry so she got a Sig P938 but we both still enjoy shooting the CCP at the range.