Originally Posted by
joshs
Again, I don't think you should be able to induce the amount of parallax that you are getting with a quality red dot. Something may be wrong with either the optic or how it is mounted to to slide.
As far as how to deal with the issue of parallax more generally, it's the same as using an RDS on a carbine or, to an extent, reading iron sights. You still need to understand the aiming device and how it affects what you need to see to make a given shot. If the dot is buried all the way to the side of the window, trying to make a shot that is a very low probability shot (given shooter skill, mechanical accuracy, and ammo) probably isn't going to work. However, I think that this is also something that is very hard to do unless you are artificially setting it up. I find that most shooters tend to automatically center the dot in the window as they complete the trigger press.