So named "Mandula" is an experimental hand-made muzzle brake. It's very big, but very effective. I can't exactly estimate, but when I tried it seemed to reduce recoil 2 times or even more. And I very like what it looks like. Just noticed, you could look at it in a previous thread, here: http://forum.saiga-12.com/index.php?showtopic=9909
Several extra pics: