In part: "The sale of any assault weapon-related parts or accessories will not be permitted (applies to all parts and accessories related to any firearm defined as an "assault weapon" by federal or California law)." [emphasis added]
Source:
http://forums.ebay.com/db1/thread.jsp?forum=100&thread=410153527&modified=1085975568458
Source:
http://forums.ebay.com/db1/thread.jsp?forum=100&thread=410153527&modified=1085975568458