So I have been playing around with these QD end plates for the AR15. They are a replacement receiver end plate that had a QD socket built right into it. It makes for a very convenient sling mount location.
I was researching a different potential problem with these, when one of my rifles dropped off the sling.
First, I found with any brand QD end plate, many stocks will press the QD release button if the stock is completely collapsed. Extending the stock while the rifle is hanging from a sling will cause the QD to disconnect from the rifle with the majority of brands of QD swivels.
But then I found that the Damage Industries LLC. QD End plate allows the QD sling mount to come out if the QD sling mount is rotated.
For now, I would suggest that if you buy a QD receiver end plate, get one from brands like BCM, Noveske, Magpul, etc. The Damage Industries one just doesn’t work.