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First released in 2005, the Nerf N-Strike Maverick REV-6 has become a toy design classic. The six-round revolver fires foam darts, but former NASA engineer and current science YouTuber Mark Rober decided that wasn't enough foampower for him. Thus he created, with a little help, this rather scaled-up version that fires plunger-tipped pool noodles:
Okay, that was the kid-friendly video. Ryan and David of Eclectical Engineering subsequently replaced the air system with a black powder cannon, inadvisably creating something with true firepower. While we're not willing to embed the latter video here, the curious among you can check it out on their channel.