The somewhat famous rifle built to scale, real life measurements, features a simple rig to allow the barrel to turn, and the bipod to fold.the exposed mechanism isn't %100 done as i couldn't find enough reference to understand it, but as far as the eye can see it should be enough.
190.500 verts and 188.352 faces on the subdiv models and 11.974 verts with 12.066 faces for the subdiv ready ones