The devices - priced at $500 - generated $10 million in sales for the company during its pre-sales earlier this year.
Amid an ongoing national debate over gun reform and the Second Amendment, some took issue with the fact that such unsafe machines were sold for a mere $500 by the Boring Company, which did not require a background check of would-be flamethrower owners.
The billionaire inventor and chief executive of Tesla and SpaceX announced the sale of the flamethrower previous year.
'Works against hordes of the undead or your money back!' Musk joked in January, when customers were still able to order them online. "For simple & concise instructions, we drew upon wisdom in great Dr Seuss book "Green Eggs and Ham".
It's finally been shipped to a small number of people who are using their new fire spitters to light spliffs, burn the top of creme brulees and generally torch everything in sight.
Don't call it a flamethrower. Prices range from just under $3,000 to one listing with a "Buy it Now" price of $20,000. Numerous listings are priced in the $2,000 to $3,000 range.
Choosing one of his favorite communications forums, Musk took to Twitter to post some photos of the flamethrower customer pickup event, accompanying his tweets with enthusiastic comments. And some see Musk's latest ploy as particularly reckless and insensitive.
But The Boring Company had an even bigger surprise for their customers, and this was to hold a special flamethrower pick up party on June 9 in Los Angeles so that the first thousand flamethrowers could be personally distributed, something that has gone down as a treat with buyers. "I bought something completely awesome and frivolous, so I'm going to also donate $1000 to the California Wildfire Relief Fund", he said on Twitter.
Musk's Boring Company has already built a shorter tunnel on SpaceX's headquarters in Hawthorne, California.