Mac's Flamethrower
After some searching I identified MacReady's flamethrower. It is a Vietnam Era M2A1-7. Here it is-

Thanks for posting, interesting - looks like Mac's indeed. T "Now put those torches on the floor and back off... Way off."

It's easy to find pictures of the earlier, WW2 flamethrower. The Vietnam Era one seen here wasn't used for very long. They were deemed obsolete after a few years of use and some were sold off to private parties (Hollywood etc.) but most of them were destroyed. I'd love to find a de-activated one or a mock up for my costume.

thanks Jared
That's great information Jared thank you. Where did you find the diagram? I ask as I definitely want to beef up the 'Nam elements in my MacReady bio (perhaps even doing a separate page). In fact I should probably email this to the figure maker now. Appreciate all your expertise in Mac's costume, gear sir. best Kim

No problem Kim, glad I could help. -Jared