Not to bring up an old topic but I have an IK date coded 94 to go with my IK date coded SP89 both turned into MP5 and MP5 respectively. Was curious how rare the IK 1989 94's are? Mine did have the castle nut rear sight but looked new when I got it.
They were not all 1991 made, I have 2, and I think one is older.
We had 40+ of them, all were full of brass shavings, most looked like they hadn't been cleaned in ages. I hand picked 2 for myself and a few for some of my land cruiser buddies. At $2200 each.....should have bought more.
And now 2017, these guns can be bought in CT due to the fact they are pre '94 :) Gotta love CT!