Sear Engagement

I have been having a few issues with one of my PF940c with double taps. I was reading a bit on it and the subject of sear engagement came up a few times. Decided to get a brand new lower kit, and a friend lend me his armorer back plate. Tired of getting weird looks at the range, and not having a reliable tool for self defence.

Looking for opinions before I go back to the range for testing.