AK-47 copies, as with most military copies, were and are made by more than one company. Some are better than others. See the AK-47 copy page for more. Some are better than others. See the Galil copy page for more.
Page lacks a lot of details, but there some there.
Some are better than others. Most of them seem to interchange, with the only difference being in nameplates. See the M-16 copy page for more. Visit the .22LR Tommy Gun Page for more information, photos, values, etc. They were cuirved, thin and smallish.