Yes, it is generally recommended to clean a Glock before shooting it for the first time. While Glocks are known for their reliability and durability, cleaning the firearm prior to its initial use ensures that any excess oil, debris, or manufacturing residues are removed, which can potentially affect the gun's performance.
By cleaning the Glock before its first use, you can inspect its components for any abnormalities, ensure proper lubrication, and familiarize yourself with the gun's disassembly and reassembly process. Additionally, cleaning the firearm allows you to become more acquainted with its parts and overall functionality, which contributes to responsible firearm ownership and safe shooting practices.
Always refer to the manufacturer's guidelines and instructions for specific information on cleaning and maintenance procedures for your particular Glock model.