Massacre Gun is a widescreen, black and white, Japanese gangster movie from the era when Nikkatsu Studios was turning out dozens of such titles in the sleek “international” style they called “borderless action”.
The story is as formulaic as possible: Two brothers are members of a yakuza gang, while their youngest brother is an aspiring boxer sponsored by the boss. In the opening sequence, the oldest brother (the ubiquitous and distinctive Joe Shishido of the surgically-altered chipmunk cheeks) is ordered to kill his lover because she’s really the boss’ girlfriend. He does so, and this causes the youngest brother (Jirô Okazaki) to diss the boss (Takashi Kanda), who has the boy’s hands crushed. In other words, it’s an escalating series of vengeful ping-pong moves that can only end with lots of corpses. The “massacre gun” turns out to be a high-powered rifle used in the final shoot-out on a bridge under construction.