FDLE Firearms Practice Test

What type of lubricants should be used for firearms to avoid gummy buildup?

Heavy greases that attract grit Oil-based lubricants only Water-based lubricants Light, pistol-rated lubricants; avoid heavy greases that attract grit and become gummy

Correct Answer:

Light, pistol-rated lubricants; avoid heavy greases that attract grit and become gummy

Explanation:

Friction reduction in firearms must come with a lubricant that stays clean and thin enough to form a smooth protective film. Light, pistol-rated lubricants are designed to stay at the right viscosity under normal use, so they reduce wear without attracting dirt or breaking down into sticky, gummy residue. Heavy greases tend to trap grit and powder fouling, and they can polymerize into a gummy layer that slows movement or causes jams. Oil-based or water-based options can leave inappropriate films or wash away in dirty or wet conditions, making them less reliable. So the best choice is light, pistol-rated lubricants, which minimize gummy buildup by avoiding the heaviness and dirt-attracting properties of thicker greases.

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