dᵻɹˈɛkt ˈæktɪŋ ðə tʃˈɑːɹdʒ ˈækts dᵻɹˈɛktli ɔnðə hˈɛd ʌvðə nˈeɪl ɔːɹ hˈaɪ vəlˈɑːsᵻɾi, ɔːɹ ˌɪndɚɹˈɛkt jˈuːzɪŋ ɐn ˌɪntɚmˈiːdiət pˈɪstən ɔːɹ lˈoʊ vəlˈɑːsᵻɾi
Direct acting (the charge acts directly on the head of the nail or high velocity), or indirect (using an intermediate piston or low velocity)