All of them feature a bayonet lug and flash hider capability (since they are preban). They all shoot the 7.62X39mm round except for the 5.56X45mm 84S. They are all considered AK-47 variants, but in order to have an AK-47, it must have full auto capabilities. Norinco and Polytech don't differ too much. Milled VS stamped do differ. A milled receiver is milled out of a solid piece of metal while the stamped is just made out of sheets of metal. Many argue that the milled is better and others argue that they are basically the same except that the milled is more stronger and durable. If you want an underfolder, try a Hungarian one. I know you'll love it!
Originally Posted By M4Madness: ...What are the features of all these rifles I have listed above? Which are considered AK-47's? Which is the better choice: Norinco or Polytech? Is there a significant difference between the stamped and milled receivers? ...