Metalform 9mm 10 round magazine

My experience with the Metalform 9mm 10 round magazine in the Range Officer Champion.

I had ordered 2 of these and my experience with both was identical.

In short: I'll keep looking for alternatives.

UPDATE: The metalforms and wilson 10rd mags have this same GI style follower and with my stock ROChampion slide stop, both had the issue with the follower slipping past. The CMC 10rd and stock 9 round worked with no issue. I ended up replacing the stock slide stop with the 10-8 9mm/38super slide stop which is longer and works with ALL the magazines I have. I think SA used a 45 slide stop in mine (and maybe all?). I compared the dimensions of the stock slide stop to all my 45 1911's and it is identical. the 10-8 9mm/38super slide stop (and other mfr's 9mm/38super slide stops as far as I know) is longer by a few thousandths.