Personal 1911 Mag Random Notes:
McCormick Power Mags seem to feed fine, for me, but sometimes require being pulled-free, as the follower sometimes seems to try to feed itself to the pistol, as the slide locks open on an empty chamber. (Multiple 1911 pistols, over time.)
Wilson 47D mags’ plastic followers are consumable items. Replace often.
Metalform 7-round mags, with metal followers, were THE thing, in the 1997 to 2002 time period, my second 1911 “phase.” They still perform flawlessly, today. (I went all-in with .40 and 10mm Glock, 2002-2004, then all-in with SIG P229 pistols in late 2004. I started phasing-in the 1911 again, in 2012, for personal-time carry, when I found that I could shoot my all-steel Baer TRS pain-free, as .40 S&W recoil was becoming too much, when fired from my high-bore-axis P229 duty pistol. In early 2016, I was able to again carry a 1911 on duty, due to a very-welcome change in PD rules, starting my third 1911 duty/personal-carry phase, which, while not all-in-1911, seems to be permanent.)
I am very much liking my Wilson 8-round ETMs. I just took delivery of two of the ten-rounders.