I recently bought a Norinco SKS from a friends widow. I'm not sure when he originally purchased it though. He just passed about 3 weeks ago and was in his 60's and worked the last 30 years in a gun shop. I'm pretty sure he worked in a different gun shop before that, the same one who imported the rifle. The rifle is marked NACO Ridgefield NJ Which is for navy arms company. That store hasn't been around in at least 7 years now. There is no import date on the rifle. The only way I was able to tell it's age was to decode the serial number adding the first 2 digits in my case to the number 1956. Mine was built in 1968 according to this. Is it safe to assume that the gun didn't just sit in china of vietnam until after 1989? The reason I'm asking is because of the bayonet. The thing doesn't have a bayonet on it but still has the lug and it was my understanding that as long as it was imported before 1989 the bayonet is OK. I'm thinking that it was probably imported before 1989 just because of the fact it was made 21 years before that.