The G96 isn't a GBBR, it's a gas sniper rifle.
Most people will tell you starting out with a sniper rifle is a poor choice, and I tend to agree. That being said, try it out. Seeing as you already have the rifle, you don't really have much to lose. You might be good at it. If you decide that the sniper role isn't for you then you have a rifle with some decent resale value to pick up a half decent AEG.