Never a single failure before or after the trigger job. And by following the video for installation, I found it very easy to install. During the install I did notice a disturbing click in the trigger pull when testing it before completing the assembly. I was concerned enough to repeat what I did up to that point. To no avail. But I pushed ahead and found it disappeared when I completed the assembly. I thought I would mention it just in case you notice the same thing. The trigger pull is very smooth. You'll be pleased.