NYRSCCA beat me to it. As far as I know, those rifles were made in the old DDR (East Germany) by Krico. I remember seeing them used by East German biathletes in the 80s.
And a clearification: In the 20k event they get a one minute penalty for each miss (no reloading, no spray and pray). In the sprint they have to do a "penalty loop of 150 meters for each miss. In the relay they get to reload with single rounds, maximum three, after the first five shots. If any targets are still up after eight rounds, they have to do the penalty loop, once for each miss, before they can continue.
Target size is 45mm for prone and 115mm for standing.
With a heart rate of 180, give or take a few beats.
That is 10 Norwegian golds so far, one for every 400,000 of us. If you guys are going to beat that, you need some 650 or so...