AR Reloading brass question.
About I start reloading my first .223 rounds. All my cases are from factory ammo that I have shot and picked up. After running them through the tumbler tonight I noticed all my brass has a little dent in them, every case has it and they are all in the same spot. I'm shooting it out of a AR so I assume it's from my brass deflector and that's just where the case hit but has anyone else experienced this? And more importantly will the brass be okay to reload and shoot?