I just finished threading the barrel and installing a FSB with the (fangs) on a MAK-90. Thanks for all the help from the members. I was told I needed a type 1 bayonet for the MAK-90. I found a type 1 believed to be Bulgarian, but it won't work. The rear of the bayonet won't go around the barrel between the FSB and the GB. I tried the bayonet on a Bulgarian AK-47 (SA93) with the thick barrel and it worked. I measured a few MAK-90's, all of them have slightly larger barrels than the Bulgarian. Is there a type 1 I should be looking for or should I just file some material off the rear ears of the bayonet? As always, "Ask before messing it up!!"  Thanks for any help you can give.