Asura Dynamics have released something for AR-type airsoft guns, the Gen 1 Carbon Fiber Handguards. For those who are not bothered with the lack of a rail system at the frontend and want a simple and sturdy handguard, this could be one to be put in the shopping list... "Distinctive-looking, smooth surface won’t snag on clothing or gear, and lets your hand shift position easily for fast target transitions."

Thanks to Bunny Workshop for the link.