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Colt M203 grenade launcher Each reusable gas grenade holds 18 BBs Launches 18 BBs at once Quick-launcher loading system Includes 3 mounts (R.I.S., monobloc & barrel for standard M4 Marui-type) Can be mounted on many M4 models Includes one 18-BB grenade 15" long, 3.01 lbs. Full metal