Stage 1: Simple coupler addition. Ranges of about 45m, 80+m angled.
Stage 2: Magstrike pump. Never test fired due to leaks.
Stage 3: Bike pump. No official ranges.
EDIT: Again, take these ranges with a grain of salt, among other things the barrel is seriously sub-optimal and these shots probably weren't flat.
The Hydro Cannon is a great water blaster (drenched my friend in 2 shots), and even without too much work (simple coupler addition and pump replacement), can become one of the most powerful Nerf airguns ever. (supposedly surpasses Titan in power)
