New Echo1 grenade launchers with different colours (OD, Tan, Black( and can be mounted on RIS rails of your favourite M4s and M16s now at Evike.com... "The Echo1 M203 is compatible with the M4, M16A1 M16A2, M16 Vietnam and other Automatic Electric Guns (AEGs) The Echo1 designed the M203 launcher with metal parts such as, the barrel, trigger guard, Barrel Latch. The Echo1 M203 requires a 40mm grenade shell. The Shell capacity can vary from 18 to 204 rounds per shot.

Echo1 M203 Rail Mounted Variant

The R.I.S. (Rail Interface System) version of the popular Echo1 M203 boasts the same great features as the original with the addition of a solid metal rail mount with metal thumb screws designed to allow quick and secure attachment and removal to picatinny style rails."