It moves the hopper away from the center of the marker.
The stock a-5 hopper is bulky and easy to hit.
Its a great mod for the tippmann 98c. you can get a tap cap hopper for it, which it holds about 50 rds. great for urban ops and woodsball. you can upgrade to an x7 hopper which is much nicer and lower profile then the stock hopper. there is one more hopper out there, but i just cant think of it at this moment of the night. either way you look at it, it will improve the marker.
I would recommend this upgrade to anyone with a tippmann 98c.