I had no problem with this - POF USA QD End Plate

Worked perfectly with my 2 point ambi magpul sling. Sometimes if I'm practicing breach, house to house I like a different sling setup so I have a QD on my foregrip. Other times when you're doing a lot of standing I'll go with this QD on both sides of the end plate. I like the adjust-ability of left or right. I don't really know what the insurmountable issue was with another other reviewer but I actually really liked this end plate.
Having actually used this, rolled with this, maneuvered with this, crawled around with this what I saw, was quality. I'd buy again!