noun
nail gun; nailer; riveting machine
A power tool that drives nails or rivets into materials. In Japanese, 釘打ち機 typically refers to a nail gun, but can also be used for riveting machines in certain contexts.
大工さんは釘打ち機を使って、あっという間に壁を作った。
The carpenter used a nail gun and built the wall in no time.
Compound of 釘 (kugi, 'nail') + 打ち (uchi, 'driving') + 機 (ki, 'machine').