Oh well, I decided to make this its own thread as well, even though I posted most of it in the Facebook group already.
Please feel free to add any information, "secrets", stuff you noticed or any other tidbit here as well! I love any info that can make future builds more accurate!

Sure, everyone knows they used the “THE HANSEN MFG. CO.” at the rear of the M240 flamethrower, right?
But was it the “4-HK” or “4HK” version? I got one of each!
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Well, design-wise, they are absolutely identical. But look at the second image, which is the
Propstore “stunt” flamer. It had the “4-HK” version (with hyphen), and I know of at least one “hero” flamer with the “4-HK” coupling as well.
But are those all the secrets there are? Who knows. Stay tuned for the next episode of “asking lots of questions without having a clue, M240 edition”.
Cheers!
Roman