Abstract: Duty belt core constituting a rigid backbone of a duty belt, comprising a left hand side piece firmly attached to a left hand half of a front belt buckle, a right hand side piece firmly attached to the right hand half of the front belt buckle. Each of the left hand and right hand side pieces is connected to a common back piece via side-symmetrical length adjustment patterns and safety stops preventing accidental disengagement of the side pieces from the common back piece. A belt buckle provided with extensions, as well as use hereof is also disclosed.