Ash said:But all of them will have a serial-numbered receiver. So, it's not like you can build up a rifle from mail-order parts without an FFL being used in some fashion (unless you get the receiver from a private sale).
Ash
You can rebuild a glock completely, or you can build one up from one of the metal frames recently available, but the polymer frames aren't available by themselves unless you find someone that has stripped it down completely.I believe you could build yourself a glock.