Barrel: $150-400
Gas Tube: $12.50
Gas Block: $35
Bolt Carrier Group: $200-$300
Buffer Tube and buffer: $75
Lowers parts kit (trigger): $90
Charging Handle: $25-$150
Muzzle Device (optional) $50-$150
Approximately you can be looking at spending around these prices, this receiver set with the handguard is a very good deal and SFRC also has NEA barrels on sale. Prices go up when you want nicer charging handles, target barrels, or better triggers, but you can build one for under $1000. Building AR-15s is fun! I just order parts as I see sales or while I'm grabbing something else.
NEA Accessories: https://www.theammosource.com/store/...c65fp57roldo41