Because lets face it, plain old "more of this stat" and "less of this stat" is boring.

So how about for this thing we give it stats something like the widowmaker? You gain ammo equal to the damage you do, but the downside is that you no longer have all your ammo stored in one clip and instead your ammo is divided into multiple, meaning you actually have to reload. No I didn't put any thought into this idea, but honestly I think its more interesting then the whole "more of this" and "less of this" stuff.