I can only speak on the Chinese drums, but I had (2) 75 and (1) 100 rounder.
Every time I loaded them, of which I read the instructions and wound it the correct # of times, I had failures to feed.
What would happen is it would shoot off a few rounds and it would stop as if out of ammo. I would remove the drum and look into the top feed portion. What I saw was the ammo an inch or so down in there. I sometimes could get the rounds to pop back up by hitting the drum. Most of the time I had to open the rear, close it, and shake the drum.
The drums were clean, lightly oiled, loaded correctly, and wound the amount of times specified in the original instructions.
I sold them off and of course the prices skyrocketed a few months later.
I would not buy a Chinese drum ever again. Even though others say theirs work 100%. Reason being, I bought 3 and not a 1 of them would run and had the same failure over and over. That does not instill trust for me.
Yes, I even tried shaking the drums and smacking the back once wound up to settle the rounds back. I did not see any burrs or damage on any of them. No rust, no reasoning apparent.
I worry that the copies are going to produce similar results. So paying a premium for the Chinese drum to me is a definite no-go.
