Replaces the Heister Sentry to take advantage of the mask's reflective visor texture.

Known issues:
• Seam running along top and back of helmet
• "Mouth" and some other parts invisible from the inside
• Mask customization probably doesn't work exactly right

v2 Changelog:
• Fixed normal maps, eliminating the visual seam along the top of the helmet.
• Replaced interior with a simple cylinder, resulting in all holes being patched and reducing polycount by nearly half. (Down to 2057 from 3334!)

Mask Customization Status:
• Materials: work perfectly
• Patterns: do not work
• Colors: kinda work

Seems to have been ripped from the latest Battlefront, I snagged the model from the Garry's Mod workshop and did a quick convert. Shouldn't have any head clipping problems since it nearly exactly matches the scale of the original Heister Sentry model.