This Otis Buttstock Rifle Cleaning System for the AR15/M16 rifle weighs only 8 oz. and fits nicely into the buttstock of the firearm. This system includes Memory-Flex Cables, obstruction removers, solid brass slotted tips, 100% cotton cleaning patches, a bore brush, and an all-in-one cleaner, lubricant, and preservative which allow you to quickly clean the receiver, chamber, neck and bore. The chamber brush allows you to scrub the star chamber, and a mil. spec. double end AP receiver brush and gas tube cleaners are provided for detailed cleaning on critical areas of the firearm. Comprehensive instructions are included.