Yeah that's common in recent production Glocks. You'll likely see triangular shaped dents/scrapes on the case mouths of most of your spent casings. Unless it fails to eject or ejects into your face it's not a problem.

If it does become a problem you can replace your 336 ejector with a 30274 ejector. You may also need a replacement 9mm LCI extractor. You'd order a Gen4 9mm trigger housing, remove the Gen3 trigger housing from your Gen3 frame, use a pair of pliers to pull the ejectors out of each trigger housing and install the 30274 ejector into the Gen3 trigger housing, then put the Gen3 housing back into the frame. The ejector slides out of the front of the trigger housing as shown below, and you must remove the housing from the frame before removing the ejector because part of the ejector is covered by part of the frame. When I did it I wrapped the teeth of the pliers in masking tape so that the ejectors wouldn't get scratched or gouged.

 

Yeah that's common in recent production Glocks. You'll likely see triangular shaped dents/scrapes on the case mouths of most of your spent casings. Unless it fails to eject or ejects into your face it's not a problem.

If it does become a problem you can replace your 336 ejector with a 30274 ejector. You may also need a replacement 9mm LCI extractor. You'd order a Gen4 9mm trigger housing, remove the Gen3 trigger housing from your Gen3 frame, use a pair of pliers to pull the ejectors out of each trigger housing and install the 30274 ejector into the Gen3 trigger housing, then put the Gen3 housing back into the frame. The ejector slides out of the front of the trigger housing as shown below, and you must remove the housing from the frame before removing the ejector because part of the ejector is covered by part of the frame. When I did it I wrapped the teeth of the pliers in masking tape so that the ejectors wouldn't get scratched or gouged.

Yes the mouths are getting nicked as are the actual bullets when clambering for carry. My carry rounds are Hornady critical defense Ftx nose.
When I cycle a few thru the pistol by hand racking the slide they eject in an acceptable direction but all have little nicks on the bullet and a little on the case mouth.
I have not had any ftf or fte when at the range to live fire. I hate that my expensive carry rounds are getting chewed up from just normal loading and unloading as carry rounds typically do.