3D projectiles in GZDoom?

Is it possible to create guns that fire 3D projectiles at set velocities?

What do you mean by "3D projectiles"?

Why no, if you can replace any sprite.

so sprites only?

I don't see why not, I've seen 3D monsters and Decorations in GZDoom.

This zip file includes GZMISLA0.pk3 which when used with GZDoom or Skulltag replaces the missile with a 3D version (conversion of the voxel model).

cool