I know nothing about firearms. Don't have any.
What I do have is an offer on the table to trade for 12 AR magazines. From what I have discerned on the web these retail for about $20 each making the trade worth $240. This raises some huge red flags because the value is way out of proportion to the trade value.
Is there any demand for used AR magazines? Looking at a few websites, they are sold out for new.
On a side note, if someone is interested I would be willing to sell them for $10/each or trade