Otis 5.7mm Subgun Cleaning System Cleans all 5.7mm variants 5.56mm bronze bore brush with size marked on brush stem Oversized bore brush and 5.7mm tapered chamber brush for chamber cleaning Small obstruction remover knocks out mud, snow, stuck casings and doubles as a t-handle base for included t-handle No Nonsense Warranty, Berry Compliant, Made in the USA