The G5 design was based on the Canadian GC-45 155 mm gun which was highly modified to suit southern African conditions.

During the Angolan Bush War, the South African Defence Force found itself at a disadvantage when facing opponents equipped with long-range Soviet Katyusha rocket launchers, which outranged South Africa's World War II-era 5.5-inch (140 mm) howitzers by a considerable margin.

[4] From 1963, South Africa had been placed under a United Nations sponsored anti-apartheid arms embargo that led to the creation of the indigenous Armscor military-industrial company to circumvent the arms embargo and to produce weapons systems uniquely tailored to South Africa's needs.

As an interim weapon system to act as a stop-gap during the indigenous production process, a number of Soltam 155 mm M-71 gun-howitzers were procured from Israel and entered service as the G4 howitzer.

The G5 gun has been placed on an OMC 6×6 chassis to produce the fully self-propelled G6 howitzer, and won major export sales in this form from the United Arab Emirates and Oman.