Drop in Conversion Cylinder for the .44 Cal Pietta 1858 Remington Army. This cylinder converts .44 caliber black powder revolver to shoot 45LC/45 Schofield round. Use only cowboy ammunition that does not exceed 850 FPS and never use hot or jacketed ammunition. Features 6 Stop notches aligned with each chamber and one safety stop notch located between chambers. This feature allows the hammer to be lowered between loaded chambers.