I think there is one. This was my first upper to put together so it may be elsewhere in the build as well. The gas tube seems to go in the upper receiver with little resistance.
Set screw, non-adjustable. I'm pretty sure something is out of alignment. It did not function well initially, FTE with bolt only moving 1/4 of the way backward. I repositioned the gas block on the barrel and it functioned well for several rounds.
I tested it today with mixed results. It has a gas issue. I believe the gas block is moving after a few rounds. I got it to fire 5 or 6 in a row and then it would not pick up the next round. It would load when manually pulling the charging handle. It would fire fine and eject the empty (I didn't look where) and not pick any more rounds.
I had limited time and few tools so I will look into it more after I get home.
Here it is with the optic mounted and the sling (that still needs to be attached). I'm taking it out tomorrow for testing. I let a friend look it over and test fire it. He said it did well the first few rounds then would not cycle the bolt at all. It did not have much lube on it, so that may contribute some. But I think the gas block might have moved.
I don't use Facebook, but I made an exception and went there to watch this video. If you want to make your gun shoot 70000 rounds per minute, then this is the video for you.
He's pretty damn funny.
I have not seen the articles but could that have been the person who was telling the crowd they were going to die.
Edit:
The article was from infowars. It showed a picture of a receipt for room service for two. It was posted on the Facebook page of someone who said they worked at Mandalay Bay.
There is a contingent of ISIS there, likely spreading from Indonesia.
https://www.nytimes.com/2017/09/01/world/asia/marawi-philippines-isis-civilians.html
With the rumors of a possible second shooter, did your buddy hear shots coming from above only? Or were there shots from other locations going outbound?
Another potential conspiracy aspect that I have not seen mentioned is that he was recently prescribed something for depression. I believe it was Valium but I may be wrong on the specific drug. He had only been on the med for a few months. These drugs are beneficial in a great number of cases, but can cause extreme effects to certain susceptible people.
Welcome to the forum and thank you for your service.
Feel free to tell us about yourself in the new member forum. If you are having problems with your rifle(s), start a thread about it and some of these guys can usually talk you through getting it running well.
The sling will be black webbing and FDE cord. Optic will be FDE with black covers. Should look good when fully outfitted.
I just hope it shoots as well as it looks.