Carbyne
• arclein* Carbyne’s tensile strength – the ability to withstand stretching – surpasses “that of any other known material” and is double that of graphene. (Scientists had already calculated it would take an elephant on a pencil to b
* Carbyne’s tensile strength – the ability to withstand stretching – surpasses “that of any other known material” and is double that of graphene. (Scientists had already calculated it would take an elephant on a pencil to b

No wonder cities and states might start to ban printed guns.
Imagine a gun printed in Carbyne, the inside of the barrel of which is lined with a tungsten titanium alloy to keep the carbyne cool. Think of the explosive pressures that you could use. You could shoot recoilless, accurately, over 5 miles. Your slug would melt from the heat of the air friction alone.