The 320 beat or matched glock on price, better trigger, easier to clean/ repair/ change size.
But the trigger that's in the new glock didn't come out till after the contract bid.
Sig also came in with a price that was way below the norm for them.
But I would have to say that the trigger was what hurt them the most. that and I don't think that they were expecting Sig to come after the contract so aggressively.