Great post. I have two out of 3 carms with the same problem. I foolishly threw the two small broken stopper tabs away. I am thinking of a work around. Perhaps a small flathead screw through the back of the mag? I am going to try something. I will post pics if it works.
I find it quite satisfying to shoot at various yardages out to 100 yards, figuring the holdover. Agreed, my rifles shoot better than I can hold them. I see we are neighbors, ( L.Leon ) , we should shoot some time.