I am still waiting on my LT-839 MRO mount (arrives Saturday) and the MRO (arrives Monday or Tuesday), but here are th epics of a build with the new LaRue Tactical LAT handguards (M-LOK). Mine is the 13.2" version.
https://i.imgur.com/ysAcKbK.jpg
https://i.imgur.com/9LwWaXT.jpg
https://i.imgur.com/BqtypPO.jpg
https://i.imgur.com/EiX8NkS.jpg