Don't quote me. I had a glock magazine that came out before 1994 based on characteristics. When I did some research to see if it was worth more, it seems only in Massachusetts they might be worth more. There are weird rules for people to get them though. I never actually tried to sell the Glock mag, so I don't know if it will sell for a premium. I did not see anywhere else that a "pre-ban" magazine makes a difference. Lastly I don't know if the code on the HK magazine officially makes it a pre-ban. Maybe some one will chime in.