I also have 1911s that won't run with Wilson's ETM magazines. They lock up the gun. Wilson says the gun is out of spec -- funny thing is, it's a Colt, and out of however many other brands and types of magazines I've tried in it, the Wilsons are the only ones that don't work. And I don't just mean they won't feed reliably. They locked up the gun so tight I had to beat the slide back with a leather-covered hammer.
1911s are finicky about magazines. What runs great in yours might not do well in mine. There is no certain way to know what works other than buy (or borrow) and try.
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