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