So, I'm a big fan of KAC and their products...who isn't? But I'm wondering about their 0-600m BUIS. I like the idea but I'm wondering from people that have used them, with which barrel length and projectile/load (prob M855?) are they accurate with? I know it makes a big difference, anyone who has shot a 20" and 16" @ 600m with the same ammo will agree. Can anyone give any insight on this? I have a shorter barrel...12.5 so maybe it won't even work for me past 200m?


















































