Simo Hayha - White Death Momiji Inubashiri - White Wolf
... God forbid these two from ever becoming a team since Momiji can see really REALLY far and there's a possibility Hayha can hit targets as far as she can see with his Nagant variant.
Long, turned-down bolts for the Mosin-Nagant are available as aftermarket parts on the US civilian market. In any case, the exposed section of the magazine in front of the trigger guard would preclude it from being a Kar 98K.