I have a good MKIII with the standard open sights and a Parker Hale flip out diopter fitted. I wouldn't dream of hunting with it now under any circumstances despite being capable of hitting a 40mm KZ at 35 yards 7 or 8 times out of 10. The rifle is capable of good groups even at range but the sighting system is just not reliable/good enough for hunting particularly as you get beyond 20 yards.