"The Glock Builders Handbook" by Mark Sullivan is a comprehensive guide specifically tailored for individuals interested in building their own custom Glock handguns. Authored by Mark Sullivan and published by GLOCK, this handbook provides detailed information, instructions, and diagrams for constructing a high-quality Glock firearm. Whether you are a seasoned gunsmith or a beginner looking to delve into the world of firearm design, this handbook serves as a valuable resource to help you navigate the process of building your own Glock handgun with ease and precision.