Random black polygons on custom armor

[WealthAndTaste]

I've put together a custom armor model and some parts of the model have these weird black polygons appearing on them:

http://uppix.net/d/a/1/5aec79cc0a1e319247f9a2197c563.jpg

I just cannot figure out what's causing this, I've tried messing around with smoothing groups, made sure the normals aren't flipped or something, all the textures seem fine but I just can't get rid of those.

I'm using 3ds max if that matters.

[nivea]

Sometimes I find that happens when a mesh has double verts AND your using a NiStencilProperty (double sided), to fix it either remove the double vertices or remove the NiStencilProperty.

[WealthAndTaste]

Sometimes I find that happens when a mesh has double verts AND your using a NiStencilProperty (double sided), to fix it either remove the double vertices or remove the NiStencilProperty.

I had a NiStencilProperty on at one point, but I removed it while trying to fix it and it didn't seem to change anything. And there aren't any double sided polygons, at least not on the spots that are black.

[nivea]

Then its the normals are indeed flipped, that tends to be the only reason they show up black other then what I posted before. I do not use Max so I am sorry to say I know nothing about how to go about working on fixing such issues.

[WealthAndTaste]

Well normals don't appear to be flipped here, I checked them every way I know how to check if they're flipped and nothing seems to point to them being inverted.