I don't think M2.0 45s were out by Jan 2017. I could be wrong but when the Shield 45 was released, it had some upgrades to the trigger and grip over the Shield 9/40 (based on comments on this forum). The Shield 9/40 then announced the M2.0 with, I believe, a better trigger and the 45 grip. The other thing I noticed on the M2.0 9/40 is the trigger stop was changed. Someone on the forum somehow get their trigger stuck behind the trigger stop. The trigger stop on the M2.0 9/40 was moved above the hing on the trigger.
M2.0 9:
M2.0 45:
