First Time Build Upper Assembly Question

[cory]

So no it's not a Grendel, YET. I didn't trust my first time being with our Grendel. I figured I'd get my feet wet on a relatively cheap 556 build, learn on something I can afford to screw up. I did build my lower Grendel ready, though.

When I'm finished I'll post pictures and full list of components, but for now the relevant parts, my upper components are:
Spike's Tactical Upper Receiver - Forged M4 Flat Top
"Spike's Tactical Barrel ST- 16"" M4 LE- 5.56"
Spike's Tactical M16/AR15 BCG 5.56 -HPT/MPI Phosphate Finish
Spike's Tactical Charging Handle - Forged
YHM Phantom 5.56 QD Flash Hider for our Sound Suppressor"
YHM Low Profile Gas Block, Slotted (YHM-9384)"
YHM Black Carbine Length Gas Tube-YHM-BL-04A
YHM-9638 Specter Length Lightweight Forearm

Anyways my question. I've finally got all the components on hand I need to assemble the upper. At least I hope I do.

Do I need that d**m YHM Forearm wrench for the forearm I've got? I've bought a good Armor's wrench and (I can't believe I'm saying this) I don't want to buy anymore tools for this project.

Secondly should I put some type of grease on the threads during assembly?

In advance Thanks for any and all input!