Tippmann 98 Custom
BT Combat Stock (read my review)
BT-16 Barrel Kit (read my review)
BT-16 Adjustable Sight Rail
Allows aiming with a stock and a mask
Two different sights
This is a great product. It makes aiming with the BT-16 barrel a breeze. It also allows for aiming with a mask and a stock. It works very well as a handle to carry your gun. It has two different sights, a large hole and a smaller hole and all you have to do is flip the sight down to switch. It is very easy to adjust, all you have to do is turn a dial and the sight moves left or right. It also is bigger then in the pictures, but that is hardly a weakness. It is also pricey (40 bucks)
I would get this if you have the BT-16 barrel, or if you have a stock.