Should be easily convertible. You could even put a bed roll in its place 
cheers
James
You're a funny man

IIRC some of the Chinese DoD figures came with seperate swords... maybe that's the same here
They certainly look like they are seperate but the straps etc are on the figure, I suppose you could have rifles slung on their backs instead.
I'll be honest it's not an area I know a huge amount about but it seems an odd thing to put on them. While it does a good job of saying "these are BoB figures" it alienates them from anything else. I'm sure some russian troops did pick up big heavy chinese swords, but I would expect the majority to have held on to their sabres as a point of pride, particularly if they've managed to keep their uniforms in good condition.... I find it hard to believe there were whole units/whetever that decided to take up that sword.