Yes, it's demystified me a little, too. I was aware (via a collector friend who had had an example of both) of there being 'two versions' of the .22 No5 rifle, that differed in several minor respects, including barrel length, & the provision (or otherwise) of the five shot magazine. I suspect all along that these two variants of the No5 may well have been the No5 & the No6.............unless of course, anyone does know of two definitive versions of the .22 No5.