Neopup P.A.W 20mm: A mobile, high performance, infantry weapon system for the 21st century.

(Firearms Blog h/t)

The Neopup PAW (Personal Assault Weapon) is manufactured by South African firm Denel. It is a semi-automatic 20mm grenade launcher. As far as I know it is the only semi-automatic grenade launcher designed explicitly to replace a rifle in the hands of a soldier, unlike the XM25 (I believe XM25 operators would carry an M4 or equivalent weapon).