Lol, to much.. $425 for Imbel receiver, $350 for lower, dust cover, bolt and carrier, and one set of hand guards {I paid on the high end for lower parts}. Barrel, gas parts, front sights, and locking shoulder about $250.
Looks like about about a grand into this one. Seven years ago I could do these for $300

Figure another couple hundred or more if ya have to pay for someone to build it.