This knex gun is different from other semi auto guns because instead of using manual power to pull back the pin, the tension of wound rubber bands is used, making the trigger easier to pull and very unlikely to break when you pull it.
I give credit to extreme builder for the pullback mechanism (the black wheel)
I also give credit to revtiedye for the trigger and placement of the band wheel
Pros: Semi automatic Very sturdy Shoots farther than most semi auto guns (about 15 feet)
Cons: Needs to be wound every few shots Does not shoot as far as a pull-back gun would