fxo black plastic bottom magazines

[HerbZ]

Here are photos of the bottom of the fxo magazine that came with the byf 42 (top photo) and the bottom of second fxo magazine for it I recently purchased (bottom photo). I suspect the original, because of the circular line around the hole for the pin. Haven't seen another like it. While other byf 41 & 42 P08's with black plastic bottoms fxo magazines look like the one I purchased from Legacy Collectables.

Has a anyone seen a black plastic fxo magazine bottom with a circle like this?