I just got a sub 2000 glock through an online auction. I also picked up a gen 4 glock 19C with extra mags. I wanted to have weapons that used the same ammo and mags to avoid any potential mix ups. First time on the range, I realized I do not like the standard sights and am looking for a scope mounting configuration that works well. My friend has a sub 2000 with the optional forend/rails and a red dot scope that he has not mounted yet so I am waiting to see how that works for him. I find all my shots were going low and right from what my aim point was.