銃空 [铳－]

Jyutping cung3 hung1
Pinyin chòng kōng

Definitions (Wiktionary)
  1. noun, Min-Nan
    bullet hole
    (syn.) 槍眼, 枪眼
  2. noun, Taiwanese-Hokkien
    small wall holes on a pillbox (for open fire towards the outside)
  3. noun, Taiwanese-Hokkien
    muzzle (open end of a gun)
    (syn.) 枪口, 槍口