Wild goose chase here...but it's worth a shot.
Looking for a broken or unusable lower AR-15 receiver for a FCG work fixture. The front pivot can be broken, the rear buffer tube hole broken, damaged or stripped out, but the area from the bolt catch to the pistol grip/safety detent and safety must be in spec, and undamaged, although the ears on the trigger guard could be broken, and that would be ok.
Obviously, since its a fixture, significantly less than full price is expected, but hey, you could recover some of that cost from the expensive build goof. The hard lesson has been learned already.
Send me an IM or email to discuss futher.
Manufacturers...if you've got a receiver damaged during production but the FCG area is in spec, I'm surely interested.