Hey guys, ARnoob here. I'm building a lightweight AR and I just need a little help. If I use a free floating carbon fiber handguard, like the one from Clark Custom Guns, that comes with it's own barrel nut, I still need the Barrel Retaining Ring and Weld Spring but not the delta ring, right? Also, wat parts do I need to complete my STRIPPED upper besides the following?

stripped upper
bolt carrier
Bolt
firing pin
charging handle
barrel
handguard