The Otis Big Bore Cleaning Equipment is designed to clean and maintain artillery, mobile artillery pieces and main gun of tanks. The swab/brush combo cleans from Breech-to-Muzzle(R) and decreases the amount of personnel needed to clean the weapon platform. The swab section features a sock over an expanding disc system that, when compressed, expands to i t the bore for a more effective clean. Available in 105mm, 120mm or 155mm coni gurations.