I created a Batman inspired Grapple Gun in Autodesk Maya. Above is a Turntable animation with an HDRI light from HDRIHaven.com.
The original sketch:
I only realized after I began to model that I had forgotten a trigger for the gun. This meant I had to redesign the handle. The finished model is more ergonomic and more evenly balanced. The actual grappling hook projectile was also modeled to be lighter in order to fly through the air faster.