JWH_223 and I were out shooting today. We had a bunch of the 40 rounders - some from CDNN and some from DSA. Both of them, as well as the 40 rounders from Vector, are definitely the same manufacture. Most of our mags were fairly new and had been used little or not at all. We've noticed one problem with them - some of them appear to be a little wide at the top of the magazine, making them hard to insert into the gun. It's definiely not the gun because they were the same in a variety of IMI's and Vectors. Some are so tight they hardly go in the gun, while others are fine. Has anyone else run into this problem?