Based on the good reviews I read about the Primary Arms red dot sight, I tried one out on my Mini-30 tactical version. Within the first 20 rounds, I had it sighted in pretty well at 100 yards. Unfortunately, within those 20 rounds the red dot turned into a red cluster. Primary Arms was good to work with, though, as they credited me toward an upgrade to the Vortex Strikefire. I've had success with the Strikefire on another rifle, so I'm optimistic this setup will work out much better... 
