FWIW
"Basically these were pre 89 guns caught in customs when the ban went into effect........to get them out and be able to sell them, Mitchell and ATF came to a agreement to bring them up to the then new current regs.......Mitchell scrubbed the original AK-47 + RPK-47 markings which were banned by name....and replaced with " m-90" - model 90.......they also had to remove original stock sets , pin flash hiders in place, remove nite sites, shave sides of bayonet lug...The original stock sets were usually included in the box and were later approved by the ATF to put them back on the gun- There is a letter somewhere online attesting to this .....Great guns i have a Few M90 mitchells , and a bunch of the pre 89 ones as well........ Essentially same gun...... You cannot compare these to the current kit guns/U.S. builds......"
Could not load the ATF letter because I am not a member of that forum but here is the link-
Found this in this thread-
http://forums.gunboards.com/showthre...er-Certificate