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I have no idea why they decided to go with SIG over this. It's just basic, it's simple, and it works. And it also doesn't go off when you're holstered at your side.
It's actually mostly on Glock. The Army set a number of key characteristics that their gun had to have, and Glock said "well that's stupid" (they were) and did less than half of them, and set their per-unit price something like $150 higher than SIG to boot. And they STILL took a narrow second, despite not meeting most of the judging criteria.
You're conflating the M9 and M17 trails. Glock didn't submit to the M9 because it would require such a significant redesign that they really couldn't do that early in their existence. For the M17 trials, glock did the redesign and performed best, but Sig met the standards and were cheap enough to automatically win the contract.













