New Super Duty AR-15 Keeps Jamming .223

So I bought a 14.5" super duty upper during black Friday and finally brought it to the range the other day. I brought a case of igman .223 . I couldn't make it through 2 boxes without having to mortar it out ever few rounds. I noticed lines going down the brass. So I go home and strip it apart and clean it and clean the chamber really good and the bolt etc. I removed the bolt and dropped a round in the chamber and it didn't stick it fell out (igman). I tried to hand cycle some rounds and it will stick every few rounds. I have a box of 556 I can try but I'm hoping it's the ammo not the upper. I already called G$ and they said to try the 556 and if any problems send it back in. Is it normal for this to happen with igman? I was able to hand cycle the LC 556 no problem. I noticed also that when I used my laser bore sight that you just push in the chamber it came it scratched. Any ideas? Hard for me to get to the range as I have two kids, but I will try the 556.

Here's is a picture of the brass that would manually cycle without jamming (556) and the cases from the igman ammo https://imgur.com/a/JHUIGsA

submitted by /u/PreBanCollector
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