Picture looks like the thing is crooked. Compare the rear sight to the front blade. Might be just the angle though. The guy seems to be reaching a lot to the forestock too. He needs some Carbine operating and IA lessons too. I wonder if he's left handed.
"...first shot hangs up..." Looks like a mag lip issue. Easily fixed with fine, long, needle nosed pliers. My one 30 round mag needed the lips tweaked open a tick(that's less than a wee bit.) to get it to feed reliably.