Knex Four Gun By Grasi in LivingLEGO & K'NEX1321Save PDFFavoriteIntroduction: Knex Four GunBy GrasiFollow More by the author: About: Hi, I'm Grasi! I like to build K'nex. I live in Austria. I hope you like my instuctables. Please subscribe and click Favorites. More About Grasi »Knex four gunStep 1: Step 2: Step 3: