The difference is there. I don't know it If it is big or not but it is real. A longer sight radius is the biggest difference. The longer radius makes it easier to place quick accurate shots.Have and love shooting my 4" ppq 9mm. Since it is my go to Home Defense and rarely carry it (although it is easy to carry), was thinking why not just go 5".
Big differences? I mean...4" vs 5" should shoot better. Just wondering how much better if anyone has experience between the two firearms. THanks.