Railgun - wrong sound?

[|K.O.S.H.]

Sorry, if this is the wrong forum for my issue.

I tried (and succeeded) to mod the sound for the railguns and i noticed, that the default sound seems to be wrong.
The bullets of teh paranid and also split railguns use pulse-fire sounds.
In the sound library there is a particular sound defined, and the (much cooler) audio file is also available.

The bullets just dont reference it.

Is this a bug or a feature?