Have been using these for years in my 2011 9mm and 40 they are the toughest. And you can rely on them even with high round count activities. 

All race guns should have one. 

It took myself and a friend about three hours to install in my STI DVC Open. My friend has built several of his own guns in the past when he had access to a lathe. The firing pin stop did fit the Aftec. I purchased a new one. That added time to fit it to the slide and Aftec. I saved the old one incase I wanted to return to the original extractor style.