I prefer this "Rock" because I got one just like it.
Nice piece of equipment, I have use beer bottle caps as a target up to 480 meters with it and drop them without problem, one shot per cap. It shoot sub moa all the way to 800 meters, and you can easily hit man size targets over 1000 meters away. I have given few quite nasty surprises to some unpleasant customers with this, because with it's reflex suppressor and subsonic round it is silent as a thought, but even more accurate than without silencer