The instruction for the installation of the GPMG mount was 21 Mar 1975. The early M38 and M38A1s were disposed of with the introduction of the M151A2 fleet of 1974 production. So it is entirely possible that by the time the M151A2 made it to the unit, it well could have been 1976 before the M38A1 was withdrawn. In that case, it may have had the GPMG mount.
The installation instruction for the GPMG mount mentions that it is applicable to ECC 121101,121201,and 121301 which I believe was the three generations of M38A1 in Canadian service (M38A1, M38A1Cdn2, and M38A1Cdn3 respectively).
The NSNs listed appear to be more from about 1976 or even 1977, but sometimes it took a little time to codify the items.
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