What does the gauss attachment do in crysis 2?

I have used it in multiplayer and it seems to do nothing. I heard it takes down enemy energy and I have heard it is powerful and accurate but no definitive answers. I need to know 100% what it does any help is appreciated :)What does the gauss attachment do in crysis 2?
The gauss attachment is similar to the other under barrel attachments. The gauss attachment works like the gauss rifle like the shotgun attachment is similar to the Marshall or how the grenade launcher is like the L-Tag. The gauss rifle is an extremely powerful sniper rifle.