Been using them for years. Have one for my AR-10 and one like yours the covers most of my nines.......they make a dedicated one for CZ- Scorpion magazines, of which I have two. Wouldn't be without a Up-Lula.
After checking out their web site, it seems there is a lot of cheap clones packaged with the Uplula name and uplula type packaging.
Chinese as near as they can tell.
They won`t hold up like the original...dale