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This is a paid asset, but now you can download Animated Arms With M-16 Free.
Animated Arms With M-16 v1.2
Animated human arms with M-16 for First Person games.
Model has 4,644 polygons and 4,974 vertexes.
Pack include 10 animations:
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2048 x 2048 diffuse, specular and normal texture maps for hands and rifle.