I had a very pleasant chat with IMA, and they have revised their website so that the "Mk IV" designation on their website has been changed to Mk II. I think I would go crazy if I were allowed to run free in their warehouse. Totally off topic, but I want to show off my newest toy. This is one of the untouched Francotte pattern Martini Henry rifles from IMA. All markings in Nepali, including a rear leaf sight graduated in Nepali numerals.
(Added as I continue to clean and disassemble this rifle:) As long as we're discussing odd markings, consider this one from the front barrel band of an obviously Nepalese-made weapon: