Aero precision upper receiver $100
Aero precision Atlas S-ONE 15" handguard $175
KM Tactical hybrid nickel boron bcg 6.5 grendel type II $100
Ambi charging handle $50
Black Rain Ordinance 6.5 grendel type II barrel straight fluted heavy barrel 18" 5r rifling 1:8 twist black nitride finish $250
Griffin Armament taper mount minimalist brake $85
Odin works low profile gas block and gas tube $40
Magpul sling swivel mount $20

All together I spent $820 plus assembly at The Rock Custom Guns (I don't remember how much that cost).