This one is a TA miniatures http://www.taminiatures.com/ 8 inch columbiad. The gabions are originals that my friend cast for me. This piece weighs a ton!
TA has limited poses for the crew so I converted a couple of TA figures with head swaps and converted a couple of Dixon figures with head swaps and green stuff to come up with some variations of crew:
Next is a RAFM gun: