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Good to know the Tripp mags worked out for you! I may have to give them a shot, especially if I end up getting the STI Shadow I have my sights on....

I run WC 47D mags in my Sig 1911 Extreme, and they feed reliably. The one issue I had with them, was that the magazines would not feed when I racked the gun, only when I released the slide. After looking over the mags, and not finding anything particularly wrong about their construction, I contacted Wilson for advice. They couldn't see anything wrong from my pictures either, and asked me to send them in for engineering to look them over. Before shipping them out, I decided to test them one more time. At this point, I realized that the mags were not locking into the magwell. Once I slapped the mags in with a reasonable amount of force, they seeded properly, and the feeding issues went away. This may be an issue with the 8 round mags being slightly too large for the Sig 1911 design, but they do not seem to be causing any internal issues.