1. Do not deal with someone who is wiling to break federal law by shipping to anyone but an FFL. You can't trust a cheater.
2. If you spending more for a gun than you are willing to throw away, research and choose a reputable escrow company to hold the funds until you receive and are satisfied with your purchase.
Alum receivers work in AR design because the bolt locks into recesses in the steel barrel itself, not the receiver.
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