Bought 2 of the Norwegian contract G17 Glock mags from CDNN. They are brand new. I did notice though that the mags have a tendency to allow the front of the follower to pop up when not loaded and out of the pistol. I don't know if this will cause an issue later. The feed lips do not appear to be touching the plastic part of the upper mag. It is almost as if the feed lips are a little wide. I disassembled one and gently squeezed the lips together, and the problem is not so pronounced. They have Glock impressed in the body with a triangle below the name Glock, and appear to be authentic. I am certain they were made in Norway under contract. They were relativly inexpensive, so a trip to the range is next. They appear to function and lock up normally when the pistol is dry cycled. I may buy some drop free bodies and rebuild these later if they give me any problems. These are going with my first Glock, which is a 1st Gen rebuilt in 1998 by Glock. We shall see.