Drop in Conversion Cylinder for the .44 Cal Uberti 1858 Remington Army. Fluted 6 Rounds, Steel. Converts .44 caliber black powder revolver to shoot 45LC/45 Schofield lead round. Use only cowboy ammunition that does not exceed 850 FPS; never use hot or jacketed ammunition. 1 Safety Stop notch located between chamber. This feature allows the hammer to be lowered between loaded chambers.