The box contains parts to make up 1 unpainted 37mm 61-K Soviet Anti Aircraft gun with 2 crew and a display base. The Russian 37mm Anti Aircraft (Automatic gun) 61-K model 1939 was one of the most successful guns produced by the Russians. based heavily on the Bofors L/60 40mm AA design, the 61-K had a high muzzel velocity, rate of fire and effective ceiling. Around 9,100 were produced and were mainly towed although some were mounted on the back of ZIS-5 and ZIS-6 trucks.