Bought this new for $500 + shipping. Never fired. Upgraded the BCG with a like new full-auto bolt carrier and MP tested Bolt (got from PK firearms). A few minor handling marks from being in and out of the safe.
$450 Shipped. M/O only, no Paypal. $375 for upper minus BCG.
I have no time for gun shop lore, myths&legends, and just plain nonsense.