In the FS cutscenes we see projectile based weaponry with grenade launchers used. (no the Shivan does not explode as Mr. Adam Pletcher has said)
Remind you, that this is before FS1.
The Ruteger is a standard pistol type weapon firing it's projectile at an extremely high velocity.
Remember that it is technology several hundred years beyond ours, and it's a very high powered weapon.
As for the bullets themselves, they're sleek and designed for maximum penetration and areodynamics, the material is more then likely a form of degenerate matter such as crushed molybdenum.
These details aren't as important though, and folks like Ornaj, Plaz, and myself are still working them out through heated arguements whether Vasudans carpet their rooms with tongues or army boots

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AceStaff member FreeSpace Watch
http://freespace.volitionwatch.com/