Colin Furze made an airsoft replica of the briefcase machine gun in Kingsman 2. It’s also remote-controlled, but the real trick was figuring out how to cock and trigger the gun with one switch. Believe it or not, there’s actually a lethal version of this setup from decades ago.
Tachyon is a neat tool for airsoft enthusiasts. It mounts on any airsoft gun that has a Picatinny rail. It lets you see your ammo count, both as numbers and as bars. It can monitor your gun’s battery level and has a real time clock. It also lets you save different ammo counts as presets.