You need a 3 in (7. 6 cm) wide PVC pipe that’s 14 inches (36 cm) long and a 1. 5 in (3. 8 cm) PVC pipe that is 4 feet (1. 2 m) long. {“smallUrl”:“https://www. wikihow. com/images/thumb/b/b8/Make-a-Potato-Gun-Step-1Bullet1-Version-2. jpg/v4-460px-Make-a-Potato-Gun-Step-1Bullet1-Version-2. jpg”,“bigUrl”:"/images/thumb/b/b8/Make-a-Potato-Gun-Step-1Bullet1-Version-2. jpg/v4-728px-Make-a-Potato-Gun-Step-1Bullet1-Version-2. jpg",“smallWidth”:460,“smallHeight”:345,“bigWidth”:728,“bigHeight”:546,“licensing”:"<div class="mw-parser-output">\u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U. S. and international copyright laws. This image is not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website....