With the help of Keeper of Firearms & Artillery, Jonathan Ferguson, and a range of video game developers, we unpick the weird world of virtual firearm design and weapon names.

The Sigma SGM2 mouse owes its funky design to the intended use as a presentation device, to control the computer screen pistol-style with thumb and trigger finger.

Jonathan Ferguson, a weapons expert and Keeper of Firearms & Artillery at the Royal Armouries, breaks down more of the weaponry of Ready or Not, including the beanbag shotgun, the G36 and the UMP-45.