Originally Posted by Quentin
MBUS is the name of the front sight that is on your gas block. The GB gets very hot when you fire a lot of rounds. We're wondering if the MBUS can handle that... Most people put a metal front sight on a GB.
Oh ok gotcha... yes it does fine. the flip up site is metal I think but I ran 400 rounds threw her and no probs. So all is well I think.