I debated between the 23 and 27 and took better concealment in the 27. Even though my pinky hangs off I still grip the 27 better at first grab. Since I wear the large backstrap on my 19 Gen4, I figured why go that route with the 23. Of course if I don't like it, I can always trade it and get the 23. Now I will entertain the idea of possibly getting a grip extension even though I think it will work without it. Just wanting to know who carries them and how much do they run? Online sites?