The tattoo that Connor has on his left hand/index finger says, VERITAS, which is Latin for Truth. Murphy also has a tattoo in the same place but on his right hand, that says, AEQUITAS, which is Latin for Justice/Equality.
Connor and Murphy both use suppressed Beretta 92f pistols throughout the movie, with Rocco’s small revolver being a .38 caliber snub-nose. The .38 Snub-Nose is a Colt Python. The revolver is really a .357 magnum, but both the mag and .38 can be shot out of the handgun.
The Boondock Saints is a 1999 vigilante action film written and directed by Troy Duffy. The film stars Sean Patrick Flanery and Norman Reedus as fraternal twins, Connor and Murphy MacManus, who become vigilantes after killing two members of the Russian Mafia in self-defense.