Originally Posted by Air&Road

Learn something new every day around here. I haven't fired an M16 since the Spring of 71, and of course that was with iron sights. Even with optics I would have been shocked if you could hit anything at 600 yards, much less expend any energy at that range.

That said, I was quite an M14 bigot at the time for long range work. With an M14 I could hit a human profile target at 350 meters almost every time. My eyes were a few years younger at the time though.