We found one dictionary that defines the word firing mechanisms:

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1. firing mechanisms: Vocabulary.com

(Note: See firing_mechanism as well.)

Definitions from WordNet (firing mechanism) ▸ noun:  the action that ignites the charge in a firearm ▸ Also see firing_mechanism ▸ Words similar to firing mechanisms ▸ Usage examples for firing mechanisms ▸ Idioms related to firing mechanisms ▸ Wikipedia articles (New!) ▸ Words that often appear near firing mechanisms ▸ Rhymes of firing mechanisms ▸ Invented words related to firing mechanisms