We have been trying to come up with a discount to offer for AR15.com members, but it will have to be fairly complex. On individual parts we have more room to move than on parts kits (if you add up the individual items in a kit retail would be $600+). Let me look a bit further into it and we should be able to come up with something, if nothing else maybe organize a group purchase or something.
I'll see what I can come up with.