eBay cartridge counter grip and mag

[milesc2]

Is this a real cartridge counter grip and mag?

https://www.ebay.com/itm/Luger-1902-...oAAOSw3utY5bjj

If so isn't this a pretty good price?

I am not in the market for one, just thought it was interesting.
It's been on eBay for some time now. I assume someone would have grabbed it if legit.

To my untrained eyes the mag looks identical to this one at Simpson:

https://www.simpsonltd.com/products/m7245