Found this site and thought I'd share it. Complete upper less BCG for $265. Not a bad deal. Thinking of picking one up.
http://www.dsarms.com/DSA-ZM4-A3-Up...––M4––-DSZM4CBUPARK/productinfo/DSZM4CBUPARK/
http://www.dsarms.com/DSA-ZM4-A3-Up...––M4––-DSZM4CBUPARK/productinfo/DSZM4CBUPARK/