The ROKS-2 was designed not to draw attention, so the fuel and gas tanks were concealed under a sheet-metal outer casting resembling a knapsack; the flame projector was designed to resemble a standard Mosin–Nagant rifle.

[1] The flame shots were ignited by firing specially modified 7.62×25mm Tokarev cartridges.

It did away with the disguise for the backpack, though it retained the flame projector designed to resemble a rifle.

The fuel was propelled by nitrogen gas pressurized at 115 bars (11,500 kPa)[2] and, under ideal circumstances, had a maximum range of around 45 metres (49 yd).

Captured Soviet flamethrowers saw some use by Finnish forces during the Continuation War.