The newest Water Parks have some incredible water guns permanently mounted just for you to use. The nice thing about that is that they never run out of water. They are safe and fun to use and they rarely if ever break. 

Here is a water gun with all of that in mind and it is fun to build as well. 

It features a large fun scope which makes aiming fast and easy. It shoots a minimum of 50 feet even with low water pressure. It NEVER runs out of water as it connects to your garden hose. It has a swivel mount just like at a water park. It features a quick disconnect swivel base so once your friends learn your water gun range, surprise them and bring the water gun to them. A squirt gun like no other. It has an easy squeeze variable control trigger. It uses only one (long lasting) moving part. It also allows for changeable water nozzles for more water flow. 

Once you have built this Water Park Gun it should last for years. You can even bring it inside for safe storage when the weather cools in the fall. 

So there you have it, simple fun water fun for kids and adults alike.