Well, it looks like the gun is feeding, or trying. The BBs just aren't making it out of the tube into the gun, and I have no idea why. Information seems to be very scarce, and the problem part can't even be taken apart.

YOu are turning the feeder tube every so often right?

Yeah. The problem is consistent with all three tubes. Best run ever was 3 shots with BBs coming out.

You might have bent the brass tubes... that will cause the BBs to sometimes jam at the kink and sounds a lot like what you are experiencing...

That is one of the downsides to that shotgun... the damn tubes are easy to break.

Hmm. Is there a fix for that, or will they have to be replaced (that's like half the gun).

You can TRY to fix it... but it won't be easy. Basically you would need to force a 6mm rod inside the tube to make sure there is no catch/ding/dent that blocks BB...

I know some guy made a replacement set of tubes with aluminum...

But If I had to make one, I would use carbon fiber tubes. They are cheap, light and can be reinforced with epoxy very easily.

With some work, you could also build a better system for the magazines...

So I give up. Still don't get it. I don't want to basically sell a brand new gun after not having gamed it for parts gun price, though. Maybe I'll seek a gun doc. Does anyone deal specifically with gas shotguns?

I have a parts shotty. PM me.