I recently purchased a new Hard Chromed STI Edge .40 from Dawson Precision, with 4 tuned mags (also from DP). When cycled by hand, the gun works flawlessly. But when fired, the rounds either nose dive into the feed ramp, or they just don't go into battery. I have played with my over all length from 1.113 to 1.140, and this does not seem to have any effect either way. I then did a search and found a suggestion to modify the mag spring by bending the third coil down. This seemed to help a little, (the nose diving is not as constant), but it is still nose diving. The main problem is that this is not consistent, it seems to happen only every fifty or so rounds, which is making it real hard to diagnois. The rounds pulled out after each malfunction have an imprint similar to a half moon with a line under it, as if it slammed into the bottom of my feed ramp. When cycled though, my rounds hit the top of the feed ramp, nowhere near the bottom. It does not seem to matter if I shoot factory ammo or reloads, I still have the problem. I have shot approximately 1000 rounds through this gun trying to figure out what the problem could be. Today I tried a friends set of mags which had grams followers and springs with dawson base pads. While using these mags, I could not reproduce the problem. I then tried my mags, thinking that they were the problem, but of course no malfunction. Has anyone ever had problems with tuned mags from DP? I am really getting frustrated, but I really don't know who to blame or where to start. If any of you that have experienced similar problems, (and yes I have done a search and know there are some of you), and have found a solution, please help a me out. Thanks