So far I got in hand already:
AERO PRECISION STRIPPED LOWER RECEIVER
AERO PRECISION STRIPPED UPPER RECEIVER
PRI CHARGING HANDLE GAS BUSTER WITH COMBAT LATCH
Sell this, look at a BCM Gunfighter or RA Raptor. I would look hard at the Raptor since you're a lefty.
MAGPUL MOE RIFLE STOCK - BLACK
AMBI SAFETY BADASS SELECTOR
PSA - LOWER RECEIVER KIT
PSA - A2 STOCK BUFFERS KIT.
DPMS - FORWARD ASSIST KIT
Why didn't you just buy a complete upper receiver? (meaning one that already has a FA and dust cover installed) I'm just kinda scratching my head on this one...
JP ENTERPRISES - TRIGGER POWER SPRING KIT (To be used with the standard trigger kit from PSA for the beginning. I'm plant to get later a precise trigger group, like Wilson Combat, Gissele, etc)
UTG ACCURIZING WEDGE AR-15 (I bought it because is dam cheap in case It works for my build)
... what others have said. Don't worry, I put one in my first rifle too before I knew better. :o
DPMS TACTICAL BOLT CATCH
... why? You said its a bench gun, not a tactical gun. The bolt catch in the PSA LPK is just fine.
MAGPUL CUSTOM LASER ENGRAVED TEXAS FLAG
I'm planning to get in the coming months:
MAGPUL SLING MOUNT SWIVEL KIT - TYPE 1
Why? You said its a bench gun...
MAGPUL SLING MOUNT SWIVEL KIT - TYPE 2 (To make it ambi)
See above...
WILSON COMBAT 20" BARREL STAINLESS FLUTED - 223 WYLDE MATCH GRADE SUPER SNIPER, 1-8
This thing is going to be a pig... you realize the barrel itself weights over 3.5lbs, right? You will still need a gas block and gas tube, so by the time you're done you're not saving much over a Noveske, BCM, or Centurion, and any of those three will be considerable lighter and probably just as accurate.
TROY INDUSTRIES - AMBI MAGAZINE RELEASE
Again, see above... Planning on needing to swap mags uber fast at the bench?
LANCER HAND-GUARD EXTRA LONG COOLING SLOTS 16.25" WITH 2" BOTTON RAIL FOR BI-POD
You may also want to look into the Noveske NSR and multiple other keymod rails that have come out after it... Many of these will be just as light, equal or lesser in price, and offer you more options down the road if you wish to change the purpose of the rifle.
I still need to decide on this:
Need advise to decide on Bolt Carrier group. What brand, type, material, Steel type; why?
BCM, Colt, LMT... take your pick. More reading will answer the "why" for you.
Trigger group for bench target shooting, hunting use... what to use, 1 stage, 2 stage, what brand; why?
I am pleased with my Geissele SD-E, and would recommend the same for your purpose (or the SSA-E if you want the normal curved trigger).
Need info/help to engrave lower and upper with custom name, logo, etc.
Build the rifle, shoot the rifle, worry about this later (or not at all, since you'll be wrecking the anodizing to do it).
Need help to have painted on red and white the fire/safety selector like H&K rifles.. :)
Build the rifle, shoot the rifle, go to Wal-mart and browse the paint section.
Need help to order a good quality custom engrave ejection port cover.
Build the rifle, shoot the rifle... you get the idea. I don't see any of these as "needs".
Scope, at least 14X under $500. Brand, model,?
For under $500, I was pleased with the Nikon Monarch series. And I happen to have a 4-16x42SF Mil-dot I no longer need if you're interested... PM me.