There really isn't a checklist because a great deal depends on what kind of used rifle you are in the market for. If you are a collector and looking for an authentic historical firearm, then many factors come into play that don't mean anything to someone just looking to tow one behind their 4-wheeler like EPEK does with his bow.
As far as the basics:
-Check the bore to make sure there is no rust or damage. This can be done with a portable bore light.
-Sight down the barrel looking for any bulges or bends.
-Inspect the finish for anything other than the normal wear and tear (small scratches, minor wear on the bluing, etc. all happen during field use).
-Look at the action and if applicable take the firearm down. It's easy to clean up the exterior of a gun but when you look at the bolt, action, etc. be on the lookout for signs of hard use. Rust or damaged parts being the most apparent. A well-kept gun will be clean with no rust, and the parts will have a light coating of oil.
Beyond that make sure the gun is functional and as represented in the ad.
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