Further to the warranty concerns.
We just got back a MH the complaint being failure to feed or eject.
It seems that despite pretty straight forward instructions from the manufacturer, ENGINE MOTOR OIL was used to lubricate the entire rifle.
The buffer tube literally had oil running out of it, which makes the buffer REAL slow in moving slowing down the bolts movement.
The motor oil also "coked" all around the gas rings essentially seizing the gas rings but also gumming up the rotation capability of the rotating bolt to the point that the bolt could not be rotated by hand.
THIS is NOT a warranty problem, it is clearly an operators lack of understanding and attempt to be creative when clearly creativity is not a good idea.
Photos to follow.