Wilson mags help a number of problem guns feed reliably but sometimes they just mask a problem with the gun. On the other hand, the supplied mags may have been defective. I'm leaning toward defective factory mags. I would definitely contact Sig and see if you can send them back. If they aren't in spec, they should send you new ones. If they are in spec, you've lost nothing but some time and you know not to use the mags.
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