I haven't seen mention of Rizzini's name in CSMC advertising, but I'm pretty sure that's the origin...not that that's a bad thing. I believe their 'round body game gun' has been on the market ~4 years, and maybe a year ago csmc became the distributor.

http://www.rizzini.it/index.php?option=com_hotproperty&task=view&id=43&Itemid=97