One user on Twitter criticized Musk for promoting and selling flamethrowers in California, where fire hazards are frequent. The company built 20,000 of the devices which sold out quickly.
Musk sold 20,000 of his latest weird consumer products at $500 (R6 535) a pop, apparently to raise both funds and awareness of his futuristic new transportation tube project in Los Angeles.
Those who had purchased the flamethrowers were able to pick them up and test them at the party in Hawthorne, California, with photo ops included.
A select group of people that spent $500 on one of Elon Musk's torch guns earlier this year finally got their hands on the product for the first time Saturday. The company has also sold Boring Company hats for $US25 to raise money.
Strictly speaking, Musk's creation is not actually a flamethrower because it only shoots fire for a short distance.
"Apparently, some customs agencies are saying they won't allow shipment of anything called a "Flamethrower".
Customers who placed orders for tech entrepreneur Elon Musk's flamethrowers got their hands on the products over the weekend, and some are now turning to the secondary market to turn a quick profit.
Have a look at the flamethrower in the tweet below and give us your thoughts in the comments.
Musk announced previous year that The Boring Company had received a permit to build an underground hyperloop tunnel between New York City, Baltimore, Philadelphia, and Washington, D.C. It has been the most dramatic fundraising technique for The Boring Company by Elon Musk to date and it met its fair share of resistance as well.
Musk said in May that using the future tunnelling system, dubbed the Loop, would cost as little as $US1.