1) VIS upper with a 10" or other bbl of short length (what barrel would you use?-                   Compass Lake or Rockcreek/Mike Rock or other?)
2) Troy or other BUIS (front and rear) recommendations?
3) rail -recommendations?
4) Vortex FH (non-permanent)- due to waiting on my suppressor (AAC M4-2000 mod.07)
5) Gasbuster charging handle

Lower ideas:
1) LMT or Lauer
2) LMT SOPMOD buttstock

* I will be adding to this the EoTech #551 and PVS-14.
* Register lower as SBR.

Feed me your thoughts on this project.

I'm going to have to sell the HK MARK23 that I just got to finance this one.  

I really like the choice of components but if you choose an LMT have you thought about the MRP upper? I know that would be more expensive but DAMN!