Beware of Greeks... Bearing Guns (2000)

Manos, a Greek school teacher, is forced to travel to Melbourne, Australia when the man who murdered his grandfather 57 years ago surfaces there. While the reluctant Manos is tutored in the art of revenge by old friend Stephanos, he also attempts to patch things up with his former fiance Nicki. Things get complicated though when the peaceful Manos learns that his volatile twin brother George has also come to town and is more than happy to carry out the vendetta.