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Smyth Busters: Can Over-Lubrication Cause an AR-15 To Malfunction?

It's time for another long-standing firearm myth to be validated or busted by our dynamic duo, Brownells Gun Techs Steve and Caleb. Today they take on the notion that too much lubrication on your gun will cause it to malfunction. So is it true? Can you over-lubricate a gun? One theory is that the lube will attract dust and dirt that eventually gum up the action, but Caleb says that's very unlikely. The bigger risk on an AR-15 is excess oil will cause the bolt velocity to be too FAST - called "excess head thrust". If the rifle already borders on being over-gassed, excess head thrust can lead to malfunctions. Too much oil on an AR-15 with properly regulated gas flow probably won't lead to a malfunction. But if there's any oil inside the carrier, the hot combustion gases will burn it up into carbon fouling. On other types of firearms, too much oil or grease can slow down parts meant to move fast, like the firing pin. Cold weather and excess lubricant are a very bad combo! In the long run, wear caused by under-lubrication is more detrimental to a gun than problems from over-lubrication. The best approach is to apply just enough lubricant where it's needed. So the myth is not busted because it's not a myth. You CAN over-lubricate a gun and cause it to malfunction.