*** Updated for Unity 5 ***
Three high-quality sentry guns with interchangeable mounts.
All 6 meshes share a single texture, with custom diffuse, specular and normal maps, and the vertex counts range between 460 and 970 vertices.
Also included is a script that allows the guns to track the player once they are within range (this value is editable.) The script also performs a line-of-sight check so that the gun will not track the player until they are visible.