Yes, best gun lube can be used on other metal objects besides firearms. The lubricant can help prevent rust and corrosion on metal surfaces and reduce friction between moving parts. However, it's important to choose a lubricant that's appropriate for the specific metal object you're using it on. For example, a lubricant that's safe for use on a firearm may not be suitable for use on a bicycle chain or other metal object. It's important to read the manufacturer's instructions and consult with a professional if you're unsure whether a particular lubricant is appropriate for your specific use.