Are there some pre-ban Mak-90's that are more difficult to convert to full auto, than other pre-ban Mak-90's?
A dealer has told me that some of the Mak-90's that are preban, but have the thumbhole stock, are not readily convertible. Some of these were purchased by a friend around 1993 or 1994, and I want to know if his are convertible. Is there a difference internally, similar to the AR-15 sear block, between Mak-90's?
Any help you could give would be appreciated.