I installed one today in my G26,G19,and G17. I was lucky as the three Glock parts I pulled out all had wear in their centers, But the parts are stamped and they arn't shaped perfect.
The new ones from Mr. Graham are precise, fit better, and I really like the fact that they extended out the sides a hair more than the factory part, making takedown much easier.
I will report back when I get a chance to shoot them as to changes in accuracy.
I did recenter all three rear sights in their dovetails as all three Glocks shoot to the right for me ( I'm left handed ) and this part is suppose to fix this.
I may have to buy acouple more to drop in the parts box for later projects.