In 1941, when Romania entered the war alongside Nazi Germany, IOR was militarised and was tasked to produce mainly for the Romanian Army. The first military scopes were produced at this moment for what was then the standard Romanian sniper rifle, the Vz. 24. After the war, though the production continued under Soviet domination, the company maintained links to famous Western European firms such as Carl Zeiss AG, Leica, Pentacon and Schneider Kreuznach, which assisted IOR in its modernization and expansion in the 1970s. As a consequence of Romania's refusal to join the invasion of Czechoslovakia, the Soviet Union ceased sharing technical information and exporting military equipment (including the newly designed SVD Dragunov). Accordingly, Romania designed the PSL rifle as a substitute for the SVD Dragunov, and IOR was tasked with developing a scope for the rifle as a replacement for the Russian PSO-1. The result was the LPS 4x6° TIP2 telescopic sight, which became the standard Romanian sniper riflescope.