Absolutely not. This is a bit misleading, anyway. There are caulk guns that claim to mitigate 'dripping' or caulk that exits the nozzle after you release the pressure on the trigger - but if you use cheap varieties of caulk - they will 'drip' no matter what gun you have them in. DAP is famous in my experience for having multiple products that 'drip' like crazy when applying.
All caulk guns like these have the same style of setup. The rod pushes against the seal in the bottom of the tube to move the caulk up and out of the nozzle. Sausage style caulk guns are a bit different and a lot more expensive. This type of caulk gun is of the 'beginner' variety and made for very basic caulking tasks.
No it was not
It is easy to load the gun just make sure that the pin is all the way back insert the back part of the tube first then push the front part of the tube down as the tip enters the front part of the gun squeeze the trigger a couple of times & the gun is ready to use just cut off a small part of the tip
there is a lever to release the grip on the tube. Then you remove the tube. There are utube videos to help.