A fighter version of it was also produced as the BUC and BLC; some of these saw service with the British Royal Navy, which called them 'the Bréguet de Chasse.

The Type IV was a two-bay, equal-span, unstaggered biplane that seated the pilot and observer in tandem open cockpits in a nacelle that also carried the pusher engine at its rear, and the tricycle undercarriage.

[2] Soon after the BUM entered service, the French Army requested that an escort fighter version be developed to protect the bombers from interception.

Bréguet responded with a lightened design armed with a 37 mm (1.46 in) Hotchkiss cannon, intended to pick off enemy fighters before they closed to within range of their machine guns.

5 Wing RNAS – the Royal Navy's first air unit specifically trained for long-range bombing – in Belgium from April to June 1916.