It’s a basic fact that the larger your army, the more difficult it is to supply it. Such is the case with the Russians during World War I. They had such a shortage of firearms that they contracted U.S firearm manufacturers Westinghouse, Remington and Winchester for guns. While the former two companies produced Mosin Nagant 91/30’s, Winchester supplied the Russians with a version of their 1895 lever action in 7.62x54R.
Ironically the Russian model is the most plentiful variant but also the rarest in the U.S because only a few thousand were exported back and many of those ended up getting modified into hunting rifles.