ID signal flare cartridge?

Greetings—while going through my great-uncle’s possessions from World War II we came across this artifact and do not know what it is. It measures approximately 2.5” length and .75” diameter. LC 42 is stamped on the base. Is it a cartridge for a “hand projector” signal device, or something else? Any and all help is greatly appreciated!

-Alexander Vasquez

This looks much like a .50 BMG case converted to a lighter.

Just pull off the cap.

That was exactly it! Without knowing what it was I was a bit leery of messing around with it too much put the top pulled off and it is a lighter! Thanks for the help!