Peacemakers use the Jakobs barrel, giving them increased damage at the cost of a slower fire rate and heavier recoil, which makes the burst fire inacurate at long distances. At close range, it can cause more damage than most other Dahl pistols specially with Salvador's I'm Your Huckleberry skill.
Notes
As with all pistols that use the Jakobs barrel, the Peacemaker is only available at green or higher rarities.