Pm shrek926. He will talk. You through fixing. That man is the bomb when it comes to diagnosing and fixing ar parts. To check the alignment of the gas port the easiest way I've been taught and it works is use a can of compressed air. Take the upper off and pull the bolt and charging handle out...
If your anywhere near cartersville I would recommend talking to shrek926 on here. He's been a gunsmith for 20 years and was able to fix my issues without ever seeing the weapon. By emailing him back and forth I was able to fix my ar. Chat with him he is a good man to talk to.