Boondock Saints 2The bad-guy-slaying McManus brothers, aka "the Saints," are back in action in a sequel to the 1999 box-office-dud-turned-DVD-hit 'The Boondock Saints' -- and it only took them 10 years to do it.

OK, so that's a long time -- especially if you number among the seriously diehard fans, some of whom have been known to decorate their chest with tattoos of the gun-wielding, Bible-quoting brothers' faces ... or, less creepily, mimic the bros' own tats by getting "Aquitas" and "Veritas" inked on their hands.

When 'Boondock Saints II: All Saints Day' explodes into theaters with its guns blazing on Oct. 30, it will mark the culmination of a 10-year war waged by filmmaker Troy Duffy -- once considered one of Hollywood's most promising up-and-coming young talents -- to get his second film made.