I’ve had a Glock sitting on my shelf for a long time that I’m building and went with a factory trigger because of the cost savings. Putting that thing in made me wish I would have just bought the trigger I wanted so I don’t have to do it twice. It’s like one of those brain teaser toys people keep on their coffee table. There is a million ways it moves around but it’s very difficult to get it in the right position to get it to actually sit in the frame. By far my least favorite part of assembly.