Pull the gas plug out and inspect the gas ports. There should be three, but some have four and there's a couple with two. Make sure they're clean and free from slag. And if you were unfortunate enough to get a two port, you might have to open them up carefully.
"A strong body makes the mind strong. As to the species of exercises, I advise the gun. While this gives moderate exercise to the body, it gives boldness, enterprise and independence to the mind. Games played with the ball, and others of that nature, are too violent for the body and stamp no character on the mind. Let your gun therefore be your constant companion of your walks." Thomas Jefferson
On my saiga I tried to run the cheap stuff through it at first, I had jams and it had problems ejecting the rounds. The I ran about 25 shots of the high brass ammo through it, and i now use the low brass rounds and it works like a charm. No reasoning to back it up, just if you run out of other options give it a try