Merry Christmas to me!(and all of you!)
some of the parts are years old that i got from various sources, cheap, like buttstock, springs, etc....I'll try to put a money value on parts for build cost

Specs:
DPMS forged lower ($90)
DPMS lower kit ($40)
buttstock (spare parts, but like $30 with tube/buffer/spring)
1/7 Colt Chrome Lined 20" HBAR threaded barrel (old gun takeoff, but $200 or less)
4 rail freefloat tube (used, $45)
harris tilt bipod (used, $35)
bipod adapter ($15)
Yankee Hill Machine folding sight gas block ($78)
rail covers ($16)
DPMS charging handle ($12)
Smith Enterprises Vortex flash hider (old, unknown $)
Colt Bolt and Carrier, NOS ($150)
MAtech mil issue BUIS (back up iron sight) ($85 used)
ARMS scope riser (unknown $)
DPMS teflon finished flattop (used, $50)
BEC scope, 3x9 illuminated, range drop turret, (cheap, $70, this will get replaced when my redfield gets back from repair)

screwed it together myself.
might replace the buttstock with an adjustable Magpul MSS, so if i do, add $250:-)
Used a teflon finish upper for easier cleanup, i plan on using this gun with my suppressor alot, makes blowback cleanup a little easier.
should be accurate, if previous experience with the Colt Hbars barrels i've used.

pics