Dented spent shell casings

You may need a slo-mo video to see whats-hitting-what. Looks like they are tapping the top of the slide-hood? Short of your face, that's about the only thing that could be out there in the way. What type operating slide is on this weapon? Good news is it functions and if you re-load, the sizer will iron all that out. You will always be able to find your brass at the range.

Check ejector and or spring, or slide spring, only one of mine ejects forward.

I don't really mind where the shells are landing, just wondering about the dents. I am going to replace the ejector spring and plunger and shoot it again tomorrow. I just realized that I shot this carbine a week or so ago and did not notice any dents in the brass and when I cleaned it that day, I checked the head space and it was locking home on my no-go, but not on the field gauge so I swapped out the bolt.  

Well, I changed the ejector plunger and spring as well as the op slide spring, and I still have the dents in the fired shell casings. I guess I will try a different op slide tomorrow. 

floydthecat wrote: Are you concerned about some issue this is causing with the function of the carbine, or just curious as to why the brass is getting dented?

Something to remember.  Any theories on how the mechanics of what was denting the cases? 

I believe the dwell-time was altered as an improvement with that slide type. The change retarded the moment at which the bolt-lug was contacted by the slide delaying bolt-opening...ever-so-slightly. It also kept the round in the chamber ever-so-slightly longer to reduce flash as the bolt withdrew. Maybe in simpler terms, the slide is farther back in it's rearward motion in reference to the extractor than previous styles. Maybe all it took was a thousandth-or-so to clear. I've never closely observed, but there may also be some dimensional differences in the hood of the slide as well as the shape (angle) on the T5. Again....all it took was a fuzz of difference to make it miss.