1:35 Scale unless otherwise stated 35B120 - 152mm ML-20 barrel for M1937 ML-20 howitzer [Trumpeter] 35B117 - 120mm L/44 OTO Melar [C1 Ariete] 35B118 - 17pdr 76,2mm L/55 [Archer] 35B119 - 90mm L/73 M3 gun [M26 'Super Pershing'] 35AB01 - 20mm M197 Gatling Gun [used in Helicopters and Aircrafts example: AH-1 Super Cobra, AH-1 Cobra]

See the RB Model Website for full details