As i said before, Everything made after 1965 was designated series "J" to distinguish the changes made to the trigger, bolt and magazine. A lot of people erroneously mistake the "J" series action with the first generation 110 short action. The first generation short action came out in 1960. The "J" series came out in '66. They used the 110 short action up until 1987, and were still marked series"J". In 1988, every caliber was made on a long action. The new short action (10,12 series) didn't come out until late 1997.