Yes, it's entirely possible! I've got a smooth-faced G-17 trigger in my G-19. Any older 3rd gen. trigger bar is going to be smoother and easier to operate than a new 4th gen. trigger bar. The sear kick-plate angles are different. Just so you know, the new 4th gen. trigger bars are a little safer to use than the older 3rd gen. bars. (Which is, 'Why' the factory changed the kick-plate angle.)
You may find that you have to experiment more with the type of connector you're using, too.
Last edited by Arc Angel; 10-09-2012 at 14:13..