During the Biafran War, from 1967 to 1970, both the Nigerian Federal Army and the Biafran armed forces, including some Biafran vessels, used the 6-pdr gun.
Selama Perang Biafra, dari 1967 hingga 1970, Tentara Federal Nigeria dan Tentara Biafra, termasuk beberapa perahu Biafra, menggunakan meriam 6-pdr.