I do not have an 81, but I imagine if you aren't online within hours when these hit the net, you will be disappointed.
When this sort of thing happened in the past, one well known online retailer was known to buy them ALL then double the price and resell.
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Update 10/24/19: As with all things out of the ordinary, our large shipment of these mags have now been pushed back to January 2020. We will post updates here as we get them. Please understand this is the very reason we do not accept backorders for products that we do not have...
Nope. The 300aac WILL load and FIRE in a 5.56 chamber. Bullet setback allows it to load.
Will destroy the bolt carrier, the mag, and usually, the upper receiver.
AN ODT member did it 2 or 3 years ago.