Haven't seen this one mentioned, seems to be under the radar.
https://www.congress.gov/bill/114th-congress/house-bill/4009/text
"The term ‘flamethrower’ means any nonstationary or transportable device designed or intended to ignite and then emit or propel a burning stream of a combustible or flammable substance a distance of at least 6 feet.”.
Inclusion in definition of firearm.—Section 921(a)(3)(A) of such title is amended by inserting “, including a flamethrower” before the semicolon.
(c) Ban on possession or transfer.—Section 922(o) of such title is amended—
(1) in paragraph (1), by inserting “or flamethrower” after “machinegun”
https://www.congress.gov/bill/114th-congress/house-bill/4009/text
"The term ‘flamethrower’ means any nonstationary or transportable device designed or intended to ignite and then emit or propel a burning stream of a combustible or flammable substance a distance of at least 6 feet.”.
Inclusion in definition of firearm.—Section 921(a)(3)(A) of such title is amended by inserting “, including a flamethrower” before the semicolon.
(c) Ban on possession or transfer.—Section 922(o) of such title is amended—
(1) in paragraph (1), by inserting “or flamethrower” after “machinegun”