Grenade launcher ID Please
 

I remember a while back someone posted up a link to a airsoft grenade launcher similar to this. (The one im posting up is for a m1 garand) After doing a quick search and finding the thread, the link is no longer valid, nor is there any info about the thing itself.
Anyone know what im talking about? and if there out on the market yet? I checked Red Wolf but nothing seemed to turn up.

http://www.e-gunparts.com/images/adz/817580.jpg

Probably the Mad Bull rifle Grenade
http://www.madbullairsoft.com/gl/product.php?pa=RG108