M61 Vulcan Study 02

Several months ago, I began studying the M61 Vulcan in 3D. I felt that I'd stand to gain a lot of info about how this thing works, and why certain parts look the way they do. I looked through several pictures, videos and articles as research and reference.

Here you can see the rear side of the weapon, lubrication system, hydraulic drive, rounds limiter, and other bits.