If you have iron sights that attach to picatinny rail you will need low profile MLOK to picatinny rail adapters. The adapters at the link below should work.
https://www.opticsplanet.com/aim-sports-inc-picatinny-m-lok-rail-section.html
I contacted Faxon and they recommended the Arisaka Low Profile M-LOK Picatiny rail section.
https://www.opticsplanet.com/arisaka-defense-low-profile-picatinny-rail-m-lok.html