I received my order of this site today (Sunday) after ordering it Friday.  Thankful for Prime two day delivery.  First off, this product is indeed a Magpul product, delivered in a Magpul package.  Magpul part # MAG248-BLK with bar code 873750004358.  Slid on my most recent AR build rail snugly, positioned it where I wanted it and tightened it down.  Folds easily, and snaps vertical when released.  Separating the apetures, small from large is tight, fingernail can do it, but probably best that it is tight.  So just to reassure those that see the low price and think this is a Chinese knockoff, it is not.  Genuine Magpul quality.  I will be ordering two more while this price is so good.