The American Rifleman, along with many other U.S. gun mags, is a good source of information even on new, foreign firearms. I can't imagine there are no Russians who aren't interested in firearms, especially in their military.
Without any citations, I would bet there are also members from Great Britain, China, Iceland, and other places around the world. Eeek!
This is just another example of attack desperation on the part of the non compos left wing.
Terry