Yakuza Weapon (極道兵器, Gokudō Heiki) is a 2011 Japanese film directed and written by Tak Sakaguchi and Yūdai Yamaguchi.

Based on the manga by Ken Ishikawa, the film is about Shozo Iwaki (Tak Sakaguchi) who works as a mercenary in South America.

He has a falling out with his father, the Boss Yakuza Kenzo Iwaki (Akaji Maro) and spends years in the South American jungle fighting mercenaries.

Shozo is then ambushed by his old Yakuza flame, Sister Nayoko (Mei Kurokawa) under the perception that he abandoned her when he left for South America.

Kurawaki and his assistant plan to raise an army of mind controlled thugs, which includes Shozo's former sparring partner and blood brother Tetsu (Jun Murakami), who has been driven mad due to the rape and death of his sister at the hands of a rival crime lord.

Shozo is rebuilt by Red Tiger with a M61 Vulcan gatling gun as a prosthetic right arm, and a knee mounted rocket launcher.

[2][3] Yamaguchi felt that adapting a manga gave the story a wider appeal than his other film works such as Battlefield Baseball and Deadball.