The rattle your getting could be coming from the stick mag not seeding well. I had the same gun not that long ago, with the same issues. The hole in the back of the mag where it literally locks into the gun is not in the exact spot it should be. Its about an 1/8 to a 1/16 off (to high). To remedy this I slighty elongated the hole at the bottom with a dremel tool. This made the hole sorta look like an egg. But, solved the problem, no more rattle. The drum mag, I never really did figure out. Mine would not feed well at all and getting in/out of the gun was an adventure in and off its self. YouTube helped figure some of it out.
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