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If you keep getting signs of carbon or copper, repeat the process as needed. I leave this second dose of solvent in the bore for at least 20 minutes before swabbing the barrel until dry patches come out clean. Once the solvent has had a few minutes to work I swab the bore with clean, lint-free patches and then follow up with a solvent-soaked patch. Replace your bore brushes once they wear to the point where they seem loose in the barrel. Your bore brushes should be tight but not so much that they cause you to bend the cleaning rod on the push stroke. If possible, use a bore guide in your receiver to help keep the rod aligned. These cleaners are safe for barrel steels and coatings, so you can let them soak in the bore while you work on other parts. They work best in conjunction with a good copper solvent like Hoppe’s Number 9 or Shooter’s Choice. Bronze or bronze-coated bore brushes are abrasive enough to remove most fouling without damaging the bore. Use a one-piece rod or bore snake if possible and if not, avoid segmented rods made of steel to prevent the lips at each joint from prematurely wearing inside the barrel. While you are cleaning, you can also perform a few simple inspections to catch potential problems before they cause you grief during trigger time.Ī good bore scrubbing after use should be standard practice. Metal parts that rely on close tolerances to work in concert with each other-especially under high pressure and heat-are happiest when free of heavy gunk, corrosion and debris. While revolutionary new parts coatings, materials and lubricants can extend the time between major cleanings and inspections, they still do not a maintenance-free AR-15 make. The truth of the matter is that, just like any other mechanical device, our AR-15s need to be maintained to work well when needed and outlast us in the long run. I find myself appreciating what the armorers and gunsmiths who supported me in the Army suffered through on a daily basis. If the AR-15 rifles coming into my shop are any indication, some folks are confusing the unloading and clearing of their firearms with actually cleaning the guns. Working on other people’s guns over the past decade has taught me that we all approach cleaning and maintaining our firearms differently.