I have a Glock 23 Gen 4. No mods to it really besides a pierce grip +2 extention. I've noticed a couple things, I'm not sure if this has always been the case and I'm just noticing it but I noticed that with an empty magazine inserted I cannot charge the slide. The only way to release the slide is with the lever. This is the case with stock magazines and the +2 extention. Also today I noticed that when I have the slide open and I drop a bullet into the chamber and charge the slide with or without a magazine, the slide will get hung up not close completely, unless again, I use the lever to release the slide. Any ideas what the problem might be? I polished the feed ramp and tried different ammunition to no avail. Thank you!