Found 10 sets of of NEW ArmaLite ALOSTRY Handguards for 20" rifles in our warehouse.
These fit both AR-10s and AR-15s. They require no special tools and attach without dis assembly of your rifle.
Here is a link to them on the ArmaLite website: http://www.armalite.com/ItemForm.aspx?item=10705110KIT
Note: Ours do NOT have the rail panels, but are otherwise identical.
These are available via our OUTLET website.