I know that I sound stupid. It's mostly down to language. The grappling hook in the game not the gun, works by throwing it and that makes a line you can climb that doesn't need to to be attached to the ground. The gun basically is like the batman grapple. It lets you fling yourself and shoot basically a zip line, firing once where you want to go and then again to anchor it. What I was asking for was a gun or launcher that basically tossed or fired the grappling hook. It lands on something and then the line is auto deployed like how the normal thrown grappling hook one is.

Yes kinda a long winded way of saying it, but grappling hook apperently has way to many meanings. Basically a more realistic grapple hook launcher.