If you have seen the add for one in Shotgun News stay away. Anything manufactured with the sole purpose of converting a gun to a machine gun is, by definition, itself a machine gun. Just because they added the word safety does not make it legal.
yes it is. there was a guy on another forum for ak-47's and he had to have a nice heart to heart with the atf because he got sent a full auto trigger group instead of what he thought was a regular double hook semi trigger group.