Sure, Nerf Lancers have been done before, but that doesn't mean they can't be done better. This one, from reader Nick G, is also for sale on eBay.
Perfect as a cosplay accessory, this build isn't just a showpiece; it's a fully automatic Nerf dart gun, carrying a 20-dart drum magazine. The foam chainsaw blades also spin. Should the thing jam, a magnetic access door allows the user to clear it. And it's also swapped its bulky power supply (six D batteries) for rechargeable AAs.
It's up for sale on eBay UK, asking bids to start at £80 ($125), but yours for £220 ($344). The seller says 10 per cent of the final sale price goes to charity.