This is not a 2nd A or political thread. Just a heads up. Have no idea how true it is but found this ad on ARMSLIST, so I thought I would post it FYI.
THERE ARE FEDS POSING AS BUYERS Who contact you and make arrangements to buy your AR or lower receiver, then when they meet up will look it over and find some trivial detail that they say is a deal breaker, and with great apology they back out without buying. They never intended to buy it they are just keeping tabs on who has what. The person who contacted me got me mixed up with other buyers and it was obvious he was checking out a list of people.