The Navy has been working on for more than a decade now. These guns fire non-explosive projectiles through the use of electricity rather than chemical propellants—but what makes them so deadly is how damn fast the projectiles travel after being shot.

How fast, you ask? We’re talking about speeds of up to Mach 6, or around 4,600 mph, according to the .

The screengrab above is from a of a test fire of the BAE Systems-built weapon conducted in November of last year and released this week.

As our friends at point out, the railgun was supposed to be tested at sea on the USNS Trenton this year, but that’s been delayed. The futuristic , which supposedly is capable of accommodating a gun that powerful, has been having problems of its own with its fancy-pants gun system and .

The U.S.S. Zumwalt (DDG-1000) stealth destroyer is equipped with a pair of huge guns that are so…

The railgun has been heralded as the future of the Navy’s ship-destroying capabilities, but it comes with tremendous downsides as well. Besides its gargantuan size, there’s also the fact that it could require as much as 25 megawatts of power—which —to operate, hence why it has to be on a destroyer in the first place.

That could get better over time, but the railgun’s sheer power, range and the fact that it does not require explosives aboard a ship to use make it apparently worth the Navy investing in.