Ron--I have NO expertise in these things, although I love the working ones and was a huge fan when I was younger.
I met Bill Blake in the late ‘70's/early ‘80's through Fay Metz, president then of the Logan’s Run Organization of Fans (?). He was exceedingly kind to a mere kid, and showed me the whole layout of how the guns worked. I was in awe of his working flame gun.
My understanding from those who (I assume) know more than I is that his early guns at any rate are not 100%. I posted a picture of one from that early era awhile back.
Odd though, I see that he apparently owned a film-used original, and it was a picture of HIS gun which was criticized as inaccurate here a year or so ago. Hmmm...
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