Can anyone help me diagnose this issue I'm having with my STi Edge? It is a Brazos HP Edge 5". All 4 of my mags seem to exhibit this issue with feeding. It may happen once or twice per full magazine where the case on the expended round fails to eject. It feels like it is stuck on the next round in the magazine. I'm new to the STi platform and not sure if this is an extractor issue, recoil spring, or something else. Any ideas on how to resolve this?