https://www.dewalt.com/miter-saw-recall
summary, "DEWALT Model DWS779, DWS780 and DHS790 Miter Saws
The plastic rear guard assembly can break/shatter when struck, exposing the saw blade and posing a laceration hazard.
The following miter saw models are affected:
DEWALT Model DWS779, DWS780 and DHS790 (designated DHS790AB or DHS790AT2 on the carton)"