[What if you have a ship with a big open loading area at the front, like the Ironclad, and] five dudes out the front of your ship with railguns, not locked down by NAV mode, start firing at the person in front of them?

Sounds like something we need to try. But maybe it's fine. It could be fine.

It's one of those things that systemically we're going to have to prove out how it works, but weapons I don't expect to function the way you might expect in the tunnel, simply because the physical mechanics are different.

Could be ballistic trajectories change in there.

Once it leaves the zone of your ship, all bets are off. The current design is anything that leaves the zone of your ship gets booted out. So if any projectiles leave the zone of your ship, they should theoretically get booted out of the tunnel.

But it hasn't been tested, folks, so it's on you.

The railgun does not have a jump drive. That's the whole point. If it doesn't have a jump drive and it wasn't tuned from the start, it's going to fail.