Actually it is a one and a half size scale model of the Civil War vintage Remington .44 Army Revolver that was introduced in 1863. Although it has functional parts, it is not intended to be a shooting gun, simply a conversation piece for people to heft and chuckle about. It weighs 12 pounds, and takes a pretty stout arm to hold it in shooting position, and even then it is difficult to reach the trigger. Caps of that size are not available, and I did not drill the nipple holes, so it would pretty difficult for someone shoot it.
The barrel was machined out of a solid bar of #416 stainless steel. The cylinder SAE 1045 steel bar. The trigger and hammer, etc. 1/2" steel plate material. The main hammer spring from a real heavy duty power hacksaw blade. The grips were carved from black walnut. The reason for these choices is because that is what was on hand.