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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. ;)
Part No. 217531 (3-position Navy lower). ;)
If no one here has one to sell, then here are some: ;)