After Transformers, my favorite pastime is Team Fortress 2, a game by Valve. Doubltessly my favorite element are the sentry guns the Engineers can build. I have attempted to recreate them here.
First off, the Level 1 Sentry. Capable only of firing basic bullets at an average rate.
Unfortunately, this is the only of my sentry models capable of rotation. (Though in the actual game, all of them can.)
Next up, the Level 2 Sentry. Capable of firing basic bullets at a rapid rate out of twin machine guns, and with a higher health gauge than the Level 1.
And here's the usual hind view.
Finally, the infamous Level 3 Sentry. Capable of firing basic bullets at a rapid rate out of twin machine guns, as well as firing rockets at a slightly below average rate out of it's "head". It has the highest health gauge of the 3.