Hi, Why did you extrude the trigger hole face twice - once just a little bit then a little more rather than just a larger extrude upward?
Probably to create a holding edge. You could also extrude once and then later add an edge loop with CTRL+B, but when you already know you'll be needing a holding edge there, you might as well do it like this. (This is common practice and you will see people do this all the time.)