You could save a lot of polys by reducing the number of sides on that tube going along the bottom. Right now it looks incredibly wasteful compared to the rest of your geometry. And maybe it is something about the highlights on them, the normal maps, or the angles (or some combination of all three) but the ?blades? look…
What is it? Also, you're modeling rather inefficiently, and the textures are severely lacking in thought and effort. Those 4 brackets [ along the bottom need only 16 triangles apiece, that tube at the bottom needs only 8 sides 10 at most, and using horizontal cuts (no centerpoint) will save you 2 triangles on every…