Since no one else seems to want to post it: Bolt Driver aka *Bio*Crossbow (* - Rail/Gauss if propelled by electromagnets instead of preasured gas) Very accurate weapon that fires fast-moving, physical projectiles (hallow bolts) with a slight arc. Static targets as far as 150meters away can be hit accurately and consistently, on moving targets one has to adjust the aim ahead of the target to hit it. Magazine size varies from 12 to 24 bolts. Rate of fire is low - 750 ms between shots, but damage dealt by every bolt is significant, rivaling that of sniper rifles and possibly some directed energy weapons. - Reloaded by inserting new set of bolts into the internal magazine. - Weight, hardness and shape of the bolt's shell gives makes them superior as penetrators, easily piercing hardened shells of xenofauna, releasing their payload once set depth is achieved or time after impact has passed. - Length of the bolts should make them less prone to yaw in dense substances. Also making it possible to fire in, out of water as well as underwater without losing much of the projectiles energy. Method of propulsion can vary from electromagnets to pneumatics. Bolts themselves can be used to deliver everything from caustic chemicals to harmful toxins to the target without lessening their ballistic properties. If you feel particularly evil you may even infect the target with nanites that multiply inside of the target by consuming its flesh as raw material for their own creation, dealing exponentially more damage as times goes on or until suitable raw materials in the vicinity of the entry point are consumed, leaving a gaping hole where bolt struck the target. Secondary fire removes the delay on the impact fuse inside the bolts thus turning each bolt into a miniature explosive, that showers the target with shards of the bolt's shell as well as giving a chance for the internal payload to spread over a wide area.