I wrote to Pearce and never got an answer on this so I thought I would ask here and see if anyone has an answer. I put Pearce magazine extenders on the magazines for my Glock 26. According to the instructions and advertising they add 2 rounds to the capacity. However I am absolutely unable to get more than 11 rounds loaded.
This isn't the end of the world as I added them for the pinkie extension but I was just wondering about this and if there is a cure.