I bought a 180 prefix Mini-14 stock from a member in California but not through the classifieds. He sent it before he got payment, then sent me some more Mini-14 stuff gratis.
Years ago, I bought a transferable full auto AC556 (Mini-14) from a machine gun dealer and he got the form 3 cleared in two days and sent the gun before my payment even got to him. It was $8,000.
Tony