This is a remix of RBguns' Stepup action rubber band gun. His video can be found on https://www.youtube.com/watch?v=NLb-8ofC3Zk This is a small gun so it won't hurt little kids. Scale up for big boys. Print parts. Insert trigger into main body. Make sure it glides smoothly. Try with cover on. Sand if necessary. Glue cover on. Enjoy!