Ok now I know that this is for the M&P .45 however I had a problem where my magazines were literally feeding 4 rounds and then the springs were bound up and would not feed anymore. I took them apart cleaned them and tried again and the same thing happened. I called SW on this matter and they sent me new magazines and had me send the old ones back. Then I had a package show up on my door the next week with new springs in it for the remaining magazines I had left. They also included a letter saying they had redesigned the spring and were sorry for the problems. You might try calling them on it. They may know there is a issue and take care of it for you. I will note that as it was a rather smooth dealing, the first person I talked to told me I didnt know how to properly load a magazine and that was the issue , I asked where they would like my police certification sent to saying I could handle a firearm and load it.Then the whole attitude changed.
