These videos show the new Madritsch ML40AUS 40mm grenade launcher, mounted on Thales Australia EF88 Assault Rifle, being fired with a M583A1 White Star Parachute illumination round (top video) and a M433 HEDP (bottom video).
The Madritsch ML40AUS was designed for use on the EF88 rifle. Its trigger sits within the EF88 trigger guard allowing the operator to fire it without taking their hand off the rifle’s pistol grip.
[Hat Tip: Rogue Adventurer]