I'm sure they're factory magazines. I think I've heard them called "elephant foot magazines". While I'm sure that they'll function properly, I can't imagine that they'd be a great benefit towards concealment. If you CCW, you may want to buy some 8-round "pinky-rest" mags. They're not hard to find, but you can expect to pay about $60.00 each for them (new).
Or, you may want to offer a trade to the members here.