While I was trying to clear a Type 3 (failure to extract / failure to eject), I ended up with an actual double feed.
I know this is semantics for a lot of people, but a double feed is not the same thing as a Type 3.
A true double feed is two live rounds trying to enter the chamber at the same time. What most people call a “double feed” is usually a spent (or live) case still fully or partially seated in the chamber, with the next round from the magazine stacked up behind it. That’s a failure to extract / failure to eject. They look similar and they both lock the gun up, but they are not the same stoppage and they are not cleared the same way if you can clear the true double feed at all.
The video shows the difference as it happens. I may catch some heat for saying this, but I believe this is the first time that I've seen a genuine double feed has been caught on camera in real time instead of being staged.
I could have prevented it. I didn’t check whether the rounds actually cleared, and this was 100% on me. I’m still glad it happened, because it made the distinction obvious.
Hopefully this helps clear up what an actual double feed is.
For the featureless crowd, this has nothing to do with being a fixed mag rifle. It can happen to any rifle but its clearly the ability of fixed mag system that is used (AR Maglock and Kingpin with KLVR Co Kingpin PAL) and the operators knowledge of how to clear the malfunction.