I have used this product on 2 or 3 projects and had no problems until I filled it with oil. After I oil it, a slider that hits one nail head repeatedly gets stuck in the head of the next nail. Maybe cheap nails, maybe I put 2 drops instead of 1 drop of oil, I don't know. I would recommend the product but do not oil. Also, the oil that comes with the gun has an imperfect design. Once you cut off the drip tip, the bottle will not reseal as there is a hole in the cap that comes with it.