There's an interesting Twitter feed,
Calibre Obscura, who posts various photos taken of weapons in the Middle East and Africa. Some of it is modern, but the feed turns up some interesting odds and ends, like a
desert camo painted Mosin-Nagant or
a very prettily-kept PPsH-41.
Between the strange old weapons, and the fascinating one-off modifications that show up there, it's a good view, to me, of what the Twilight equipment would look like: extensive customizations and pressing anything random into service that still works.