Hey, fellow C7 builders... I just noticed eHobby Asia is stocking King Arms M16A2 handguards. The specs sound really good, made of Nylon fiber, and you can see the profile is correct for a C7.
Check it out:
http://shop.ehobbyasia.com/catalog/p...ndguard-black/
Also eHobby has re-listed the proper butt pad for the CF style four position stock:
http://shop.ehobbyasia.com/guarder-r...ble-stock.html