This is my attempt at recreating the masks worn by the band Slaughter to Prevail, Its not perfect but its close enough to get the point across and seems to be one of the better versions out of what I can find online especially for free.

UPDATE: made a V2 with a better jaw hinge and pins for it that use m3x12 screws and m3 nuts feel free to use whatever you want for that if those pins done suit your needs it also allows you to operate the jaw with your chin now like the actual mask should

UPDATE 2: added cut off horn and one horn variations of the mask