I don't know the answer. However, I for one get tired waiting for the end of a 17 round magazine to arrive. Don't get me wrong, I don't particularly enjoy loading and re-loading magazines. It just seems as though it takes forever. I guess I felt the same way loading my 33-round Glock magazine the first time. In the middle of that loading I said to myself, "self, I'm getting rid of this thing". I got rid of it.