Small arms question, 1918?

[Adm.Lee]

I'm slowly getting around to planning a Twilight: 1918 game for Origins this year. I've gotten as far as an outline, set in Siberia. A question popped up for weaponry: if I include American PCs, they would presumably come from the Pacific or Asiatic Fleets, or the two Army regiments that moved to Siberia from the Philippines.

Does anyone have information, solid or otherwise, on deployment of the BAR? Did any go to Siberia? For that matter, what rifle would Americans in Siberia be packing? I'm aware that the Americans sent into North Russia picked up Moisin-Nagants (or the American-made copies), but no idea what's what in the East.