The following is meant as merely an FYI, not an endorsement since at the moment there's nothing to endorse:
I've been communicating with the good folks at Galloway Precision regarding the possibility of a short stroke trigger for the CM9.
They tell me they will be doing the install video this weekend and that the initial offering is 2-3 weeks out.
I'm very interested...looking forward to seeing what they have been able to do.