One of the issue I observed was the hardware/fasteners used to assemble the helmet. Out of the six, none had matching fasteners. Some of them was protruding thru the teflon locking nuts as much as 1/4 inch creating a safety concern since it was protruding on the inside of the helmet. Secondly, the visor. The inside visor in a duel visor setup was contacting the rubber trim that is glued to the edge of the helmet. Therefore scratching the visor, this was found on the 3 out of the 6. Hope the last makes sense. Good luck!