The Meridian Munitions Peacekeeper-45 is a six-shot double-action revolver chambered in .45 ACP using half-moon clips. The weapon is Meridian Munitions' mid-range revolver offering, built with a carbon steel frame and a four-inch barrel. It fills the gap between their bottom-shelf Wheelgun-38 and the premium offerings from Volkov-Saito and Crucible — a functional .45 caliber revolver at a price that working people can afford.

The .45 ACP cartridge in a revolver produces less felt recoil than in a semi-automatic because the revolver's heavier frame and cylinder absorb more energy. This makes the Peacekeeper surprisingly pleasant to shoot for its caliber. The half-moon clips provide a faster reload than individual cartridge loading, and the .45 ACP's subsonic velocity makes it inherently quieter than magnum cartridges — a consideration in residential environments where the Peacekeeper is commonly kept.

Old Faithful earned its nickname through sheer endurance. Meridian Munitions over-builds the Peacekeeper's lockup mechanism relative to the mild pressures of .45 ACP, resulting in a revolver that continues to function accurately long after the cosmetic finish has worn away to bare steel. Multi-generational Peacekeeper owners are not uncommon — families pass down well-worn examples that still shoot straight after decades of use.