Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
If I recall correctly. the 4-position trigger pack was created with the introduction of the MP5-N (initially, 0-1-3-7, later replaced with 0-1-7) in 1986. :unsure:
JB=1991, JC=1992, and IR=1993. ;)