Don't think it is the Mauser 1918 because those are basically a scaled up 98(which the actions doesn't look right for) and most wouldn't have had the mag well. The WZ35 action appears closer to that in the pic, but the trigger group doesn't quite match and there are too many barrel bands for either anti-tank gun along with no bipod.

http://en.wikipedia.org/wiki/Mosin%E2%80%93Nagant

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