Designed in 1930 by the Swedish Bofors Company, the gun was adopted by some 18 countries and became the standard fight AA weapon with the British Forces. It has an average rate of fire of 60-90 r.p.m., a traverse of 350° and an elevation capability of -5° to 90°. For action, the gun was normally lowered on to its carriage but could be fired whilst supported on its wheels. Four-round clips of ammunition were fed into the breach by a loader, whilst two layers rotated the cranked control arms. Towing vehicle for the Bofors was a Morris CD/SW 30 cwt. 6 x 4 tractor. This was fitted with lockers, accommodating 192 rounds of ammunition, a compartment for the gun crew of five men and a spare wheel for the gun.
Engine was a Morris 6 cylinder petrol unit and gears comprised of five forward and one reverse. Overall length 17 ft 2 ½ in. Markings are provided for a Bofors gun and tractor of No. 1 Battery, 8 Troop, 15th Light Anti-Aircraft Regiment attached to the 7th Armoured Div. North Africa 1940.