Save your pennies and ditch that crappy 'no tilt' green follower and pick up a magpul third generation anti-tilt follower.
They're much more pricey but it's impossible to get the follower stuck like you can with the green followers.
Try using the eraser end of a pencil and pushing straight down on different parts of a green follower in a typical ar15 magazine.
You can get the follower stuck at least 3 different ways.
I might be just nitpicking, but a good magazine is one of the greatest ways to assure reliable functioning.
Did the floorplate look like this?
Floor plates are replaced before anything else on an AR15 magazine since you have to pry up the floor plate to remove it in order to clean an AR15 magazine.