Designed for steady, repeatable performance in varied environments, the Zaffiri UPPER SLIDE PARTS KIT FOR GLOCK GEN 1-4 emphasizes functional reliability and straightforward operation. This kit is ideal for completing a custom slide for Glock models 19, 17, 17L, 26, and 34 across generations 1 to 4. All parts are made in the USA to the highest tolerance matching the original specifications, ensuring smooth handling and consistent mechanical behavior. Installation by a competent gunsmith is recommended. Zaffiri Precision is known for its high-quality manufacturing and innovation in firearm components.