Original M16A2

Mutator name: original_m16a2

The original texture can be applied to the M16A2 as a weapon skin when using this mutator.

This is not a 1:1 replica of the original M16A2, since at some point NWI changed how the handle textures work, making this a little more difficult than a simple texture swap. I quickly tried matching the two together; the result being something that looks alright but doesn't really hold up upon a closer look. I might update this in the future if I feel like improving it, since there's definitely room for that, but it is what it is for now.