ɪn hˈaɪvəlˈɑːsᵻɾi tˈuːlz, ðə pɹəpˈɛlənt tʃˈɑːɹdʒ ˈækts dᵻɹˈɛktli ɔnðə fˈæsənɚɹ ɪn ɐ pɹˈɑːsɛs sˈɪmɪlɚ tʊ ɐ fˈaɪɚɹɑːɹm.
In high-velocity tools, the propellant charge acts directly on the fastener in a process similar to a firearm.