The NSN shown in post #1 is for the newer version of the pouch, which they made out of a more rubberized material than the old canvas case. The kits were introduced for the C1/C2 as others have said, however it is (or was not that long ago) part of the weapons tech tool boxes as a general purpose cleaning kit. While the C1 multipurpose tool was a little redundant, the remaining kit was of good quality and quite useful.
The NSN is only for the pouch, and not for the complete kit in case anyone with connections get any ideas.