There were 150 Packers made, most were 454's but a few 357, 50 AE, and 44 mag's were made. Standard length was 3 inch although other lengths were made. Introduced at the 1996 SHOT Show with no special serial numbering. The Kodiak Express was in field grade and made for Kodiak Arms of Alaska as a special run. As far as I know all were in 454. Even though 100 were planned, not nearly that many were actually made. Serial numbered DF-KEXXX. Hope this helps.