Where can I get a railgun?

Excuse me, but I'm quite intrigued by your mention of a railgun. Could you perhaps elaborate on where exactly one might acquire such a device? I understand that railguns are advanced weapons technology, so I'm curious about the avenues available for purchasing or obtaining one. Are there specific manufacturers or retailers that specialize in this kind of equipment? Or is it something that can only be accessed through certain channels or with specific permissions? I'm eager to learn more about the process of acquiring a railgun.