Notes: Like many such things, the Czechs developed their own light antiaircraft gun system during their Warsaw Pact days. In this case, the twin 30mm autocannon M-53 is used to replace the ZU-23-2 in Czech and Slovak service. It is heavier compared to the ZU-23-2, and has a lower rate of fire, but the range and punch are greater. There is no provision for radar control, but a telescopic periscope is provided.