http://ebaybanned.com/product_info.php?products_id=1060
I dont see why not. It looks very much like the standard CA RIS unit. It should fit. If not the first time, you can slightly adjust the length of the barrel between the delta ring and the front sight block.
HeadOnTactical.com
Thanks. I expect to get a metal body soon anyways, and ill try to keep the weight to a minimum until then.