The Otis Foaming Bore Cleaner simplifies firearm maintenance by letting expanding foam do the hard work. This 3oz cleaner is sprayed into the breech end, where it expands to fill the bore, ensuring complete coverage and effective cleaning. Simply let the foam break down, then clean using an Otis Breech-to-Muzzle cleaning kit or Ripcord for a thorough finish. Designed to make bore cleaning effortless, this product is an essential addition to your firearm care routine.