The Lahti M/26-31 was a special variant of the Lahti that could accept 75 round drum mags instead, allowing for much more sustained fire capability.

Finnish Elite Hero comes with the following exclusive items:
-Lahti M/26-31

Once purchased, kit items are available in both singleplayer and multiplayer, provided CtB is installed. Purchased kits should become available immediately if connected to the official server, otherwise, try restarting the game.