5 round to 2 round magazine plug/limiter for Saiga/VEPR 12 gauge

In the state of PA, during certain times of the year, you can use a semi-auto shotgun. However, you can only have a maximum of 3 rounds loaded, including chambered. So I created this to limit my 5 round magazine to 2 rounds, to comply with the local laws. Figured someone else might find this useful. I've tested on my VEPR 12 (Saigas upgraded cousin), and it works just fine. I imagine it would be Saiga compatible too, since the magazines are ALMOST interchangeable.

The groove in the bottom sl