Funny thing is you can just by the fire control parts too, but possessing those and an AR lower together is not allowed unless you've gotten the stamp, and unless you know somewhere you can buy the FCG for cash/anonymous crypto, yeah, grabbing one off a rack in bumfuckistan is gonna be way easier and less likely to end you up on the wrong end of the long dick of the law.
Funny thing is you can just by the fire control parts too, but possessing those and an AR lower together is not allowed unless you've gotten the stamp, and unless you know somewhere you can buy the FCG for cash/anonymous crypto, yeah, grabbing one off a rack in bumfuckistan is gonna be way easier and less likely to end you up on the wrong end of the long dick of the law.