Colin, years ago I had to suffer thru the PSWQ, as I had all the courses, but Eryx ( :facepalm: yeah I had to take a course for a 2 day Eryx class). The Sgt who was teaching the pistol part was a buddy of mine for years - he was a student too (another Eryx victim) but he did not know the pistol if it ran him down, he lost a page of IA's and I had to explain it to him that he was missing some, this became a 35min lecture by me on how the pistol functions etc.
Fortunately our section were all relatively older folks all stuck in the Eryx vacuum - and no one got bent out of shape that I ended up doing the pistol. Having a ISCC, Small Arms Course etc does not immediately confer SME status on anything, and its not a slight on anyone to note they do not have the tools to teach something fully.