So I found a nice shooting range in my new location here and took the AR out for it's first shots. It would not eject the rounds after firing. I only shot six rounds through it just seeing what it would do and decided best not to full with it any further. It has plenty of oil so that can't be the issue. The only thing I can figure is something isn't properly lined up with the slide. The unfired casing (5.56mm (62) FMJ M855 Penetrator) falls right in and I can drop a spent casing right back in, tip it over, and it falls right out. The action slides back and forth with no issues but after it's fired and I have to pull the slide to eject the round, it's a tough pull to get it opened. After the initial tug, it slides fine. Any ideas???