Have 14 round P320, 40 cal magazines with Taran extended base pads (140 mm). With springs that came with base pads and factory followers, I can reliably load and reload on 19 rounds. This week, I received Grams follower/spring kits that are supposed to add 1 additional round (20). The Grams will only allow me to load 18 rounds (with much difficulty). I bent my Lula loading to 18.
I have chamfered and smoothed the edges of the base pads as well as the follower. This allowed me to increase capacity from 16 to 18 rounds.
Have emailed and called Grams Engineering for assistance and am awaiting their call.
Anyone else had similar issues? Any advice?