My uncles model 98 (not custom) with a 4 power scope.
Marker Setup:
Model 98c
10" DYE Excel
Collapsible Stock
20oz Anti-siphon tank
BSA 30mm red dot sight 5-MOA
Strengths:
Easy to sight, quick accurate
Weaknesses:
None
Review:
With the 30mm you can easily point and shoot. It works the same way a shotgun bead does. You put the dot on your target and fire. This thing can be bought in 42mm and 30mm objective lenses and can be bought for the 7/8" Weaver and the 3/8" Dovetial mounts. The 3/8" Dovetail is on any paintball gun with a standard sight rail. The Weaver is on the Flatline.
Conclusion:
If you want to be able to aim at people easier, get this. It does not replace skill, and does not actually make your gun more accurate. But it is great.