I have one (Viper HS 4-16x44) on my .223 precision carbine. The first one out of the box had no horizontal travel. The second has been great and was simple to swap for at the store. I wouldn't put one on a rifle for an important large game hunt. For that, I'm Zeiss all the way. My personal theory is that Vortex lifetime warranty wouldn't help me on a quality hunt.