I had my LGS install Glock factory night sights on my G26 Gen4 today after he swore he had the right parts. Of course he didn't, and installed the 6.9MM rear sight instead of the 6.5MM he should have installed. I went to the range and tried it out; if it was off much at 5-8 yards I was apparently compensating for it; seemed pretty good to me. What is the impact of having the wrong rear sight put on my G26? Wanna kill these ads? We can help!