Fire Gatling

This tool, similar to the Shinobi Gauntlet, does not require chakra from the wielder, and instead uses Fire Release ninjutsu stored within the tool as ammunition. The rotating barrels releases fireballs rapidly, causing heavy widespread damage.

Trivia

 * While not named in the manga and anime, it was named in Naruto to Boruto: Shinobi Striker.
 * The name of this tool appears to feature wordplay. The kanji for it give a pronunciation similar to type of gun it's modelled after, with the first kanji having a similar phoneme, referencing its ammunition.