I installed the Grey Guns competition trigger kit yesterday and shot it today. It has a little less over travel and is lighter 3# vs 4#. I shot a lot of doubles drills and some Bill drills. Shooting the Legion stock I thought the trigger was OK, however I think the GG trigger is considerably better. I think the GG competition trigger is on par or slightly better than the Johnny Glock competition triggers that I been using on my G17s.
Installing the GG kit was fairly straightforward using @Alma Coles videos with one exception. I was unable to reassemble the trigger bar and GG trigger with his method ( it works fine for the Legion stock trigger ), I had to use Apex’s trigger bar installation method. I suppose this is because of the different trigger geometry. I am using the flat face trigger.