Guide rods have issues
Link discussing old guide rod design: https://www.reddit.com/r/AR9/comments/1fzxdmu/cmmg_9mm_dissent_broken_guide_rod_within_25k/
In the event that link is archived, here is a picture. It sounds like customers need to reach out to them if 
Even with the new design, looks like the guide rods are still failing: https://www.reddit.com/r/Cmmg/comments/1mf8s8h/dissent_mkgs_9mm_spring_rod_failure/
This was posted in August of 2025.
‘Bumper’ gets destroyed:
See this link: https://www.reddit.com/r/Cmmg/comments/1p4f9rs/9mm_dissent_bumper_failure_after_1000_rounds/
Not readily FA / FRT / SS capable:
Yes, I know there is a company working on a linkage to get the Dissent to work with a FRT / SS but it results in a bullet hose of over 1000RPM and nothing you can do about it. IMHO, that gets old fast. That is too fast to get controlled bursts out of.
Issue with lack of tuning .45 Dissent:
In the following link, someone is having an issue running heavier bullets in his .45 Dissent: https://www.reddit.com/r/Cmmg/comments/1g4hv26/tuning_suggestions_for_suppressed_9mm_dissent/
“I can’t run 230gr reliably. 200gr is fine.”
My comments in a Youtube video below were deleted by CMMG where they said that the older CMMG ‘buffered system’ would work with .45 SMC but you can’t run that in the newer Dissent.
Being bufferless also means not as smooth:
Even beyond all these issues, it will never be as smooth as a buffered setup as I demonstrate in my high speed video here: