There are several different brands of "store bought" AK receivers, as well as Tapco and AK Builder receiver "flats" that you bend up yourself. Now there are several Polish receiver "shells" on the market, as well as Cold Steel Solutions receiver blanks. There are lots of receiver options out there, including just bending your own receiver from a sheet of 4130 from some place like McMaster-Carr.
Enforcement, NOT Amnesty!!!!!!
"If they’re going to come here illegally, apply for & receive assistance through a corrupted Government agency encouraging this lawless behavior, work under the table & send billions of dollars each year back to their families in Mexico, while bleeding local economies dry, protest in our streets waving their Mexican flags DEMANDING rights, while I have to press ’1′ for English, then they need to be shipped back to where they came from!" -Chad Miller