Which component should NOT be sprayed directly with cleaning solvent?

Optics are sensitive components that contain delicate glass elements and electronic parts. Spraying them directly with cleaning solvent can cause damage in several ways. Solvents may degrade lens coatings, cause fogging, or seep into the internal mechanisms of the optics, potentially leading to malfunction or reduced performance. Proper cleaning of optics typically involves using a microfiber cloth and optical-specific cleaning solutions to avoid any potential harm.

In contrast, components like the barrel, upper receiver, and buffer tube are designed to withstand cleaning solvents and can be effectively cleaned with a direct application of solvent without fear of damage. Understanding the appropriate method for cleaning each part of the service rifle is critical to maintaining its functionality and longevity.