One more thing, when you zero a red dot you must always remember the that LOS has nothing to do with bullet trajectory and depending on where you zero, I use 25yds which means I am zeroed at 300 and that if I am shootin target between those yardages I have to "holdover" appropriately with the 2MOA dot co compensate for bullet rise. sometimes as much a 6inches over at 170 yards where he bullet is at it peak arch.