The due date for public submissions over the upgrade of a gun range in Brisbane’s south-east has been extended to the end of April.

Sports Minister Mick de Brenni has been slammed by conservationists and Brisbane City Council over the plans to upgrade the ranges as it involves clearing three hectares of bushland that contains Koalas.

The Bulimba Creek Catchment Coordinating Committee says, "this parcel of land is the vital northern section of the Koala Coast Corridor [so] the state government should develop a biodiversity protection and enhancement plan [to protect the land].”

They also argue that no further bushland needs to be cleared.