I think I just figured something out. We have had ongoing reliability problems with the 17 round magazines that came with the new Legion, but never issues with the 21 round mags that came with the X5. The 21 round mags are marked “made in Italy,” and obviously made by MecGar. I read on SigForum that Checkmate makes 320 magazines. Sure enough, just checked the problematic 17 round magazines, and they are marked ”made in the USA,” no doubt by Checkmate.
Thank you Sig for trying to save a few bucks and give us crap!