Type: Side-by-side shotgun
Chamber: 70mm (2 ¾").
Overall length: varies with different models
Barrel length(s): 355 - 500 mm (24" - 30") depending on version
Capacity: 2 cartridges
This is the shotgun John took from Al at the ASDA in Aberdeen. It was subsequently adopted by Emma as her preferred weapon.
AYA manufacture a wide variety of shotguns of high quality in the mid to high price ranges. Al had apparently sawn off the barrels of his gun to 14", which would make it easier to carry and more manoeuvrable but shorten its effective range, make it louder and increase the recoil effect.