IIRC, they said everything made in 2020 (and later naturally) has the upgraded works. The trigger guards have a little dimple on the underside. Of course the trigger pull should also be a clue. One of mine originally was pretty heavy, the other very heavy, as was the hammer-cocking effort. Both came back from Henry with nice pulls.
I took the .410 in to get the rail installed. My smith told me he had another with an awful pull he was going to try to fix. He thought the recalled pull on mine was very nice.
