That's an Austrian 20 rounder (see the white sticker on the floorplate). I have a 30 rounder that looks like a DSA, grabbed a couple of them at the last gun show and a few more 20 round mags of unknown origin. I wanted to have a few options to play with to rule out faulty mags during my test firing.
Might have to do that sometime.
Might have to do that sometime.