If you go to dragunov.net and look in the "NDM-86" section Berg has put out some good info on the Navy Arms Imports. They were one of the earlier companies to begin importing Chinese NDM-86 rifles. They came with a desirable military green wood transit case. One thing to check is if your rifle has the "26" stamped in a triangle by the mag well. Some later imports did not. Also pop the top cover and see if it has the military Russian-style trigger group with self timer or the later import only trigger group and bolt carrier without sear trip. Also check and see what year is stamped on it. AFAIK 1979 rifles are rarer.