It's a STG-58 on an IMBEL receiver. It did not want to feed manually until I gave it a good cleaning. It was apparently stored for quite some time and had some sort of old preservative in the nooks and crannies. This is my first rifle that's not a M16/AR-15, so I'm lost as to it's intricities. I can't turn the gas adjustment, but I don't know if I'm missing something. I plan to take it out tommorrow and fire it. anything I should be looking out for?