The barrel has extensive relief chiseling/engraving depicting a mythical bird, possibly a phoenix (Hou-Ou) or Basan. The bore is oval at the muzzle and measures approximately .34 by .36 inches. A triangular front sight it on top of the muzzle, and there is a grooved block rear sight near the breech followed by a Tokugawa clan mon. A mum inlay is opposite of the lock. The fruitwood stock is otherwise mostly plain.