The RD185844P converts your Pietta 1858 Remington Army revolver to fire the .44 Colt Heel bullet or hollow based bullet. NOT FOR 45 COLT AMMO! To overcome the larger bore of the original barrel, it is recommended that you use hollow based or heeled bullets.
Please check out or selection of cowboy ammunition.
(If, after installation, you are unsure of the fit, please take your revolver to a competent gunsmith or contact R & D Gun Shop to make sure you have the cylinder installed correctly.)