Parts on order. What did I miss?

[NugginFutz]

There are ____ basic areas you need to cover with an AR15 project:

[SIZE="5"]Upper Receiver Group[/SIZE]

AR15 barrel assembly with quality extension, correct gas port diameter

Bolt Assembly (w/ejector and extractor parts)
Bolt Carrier w/key (key needs to be chrome-lined per Mil-spec)
Firing Pin
Cam Pin
Firing Pin Retaining Pin

Upper Receiver
Charge Handle Assembly
Ejection Port Cover Assembly (door, rod, spring, c-clip)
Forward Assist Assembly (plunger/pawl, spring, roll pin)

Gas Block & fixtures
Gas Tube & Roll Pin

Barrel Nut
Handguard Assembly (some have their own specific barrel nuts)

Muzzle Device & washer if applicable, with correct thread pattern for your muzzle threads

[SIZE="5"]Lower Receiver Group[/SIZE]

Stripped Lower Receiver
Lower Parts Kit
Fire Control Group (included in most LPK's, but often replaced with after-market FCG's)
Pistol Grip (same, w/screw and lock washer)

Carbine Build:
Receiver Extension Tube (should be extruded)
Receiver end plate
Lock ring
Carbine buffer (H1, H2, or H3's work better on the Grendel usually)
Quality carbine recoil spring, 10.75-11.25" length
Carbine stock assembly with latch

Rifle stock build:
Rifle-length extension tube
Stock assembly of choice
If A2, use spacer and correct length screw.

When done, your finished project should look something like this:

(Forgive me, for I have no self-restraint.)