The finish is rust bluing, that is, black oxide created by using salt, peroxide and vinegar as a rusting agent and then boiling in water till black. This was done 5 times then carded with fine steel wool before each rust treatment. When the barrel comes out of the boiling water it is hot and the solution likes it that way. Accidently dropping it in the stainless kitchen sink makes dents. Oh well, so does cast iron pans. After the bore is polished out to remove the rust formed inside though it is not heavy like the surfaces treated with the solution. Of course, it is smooth bore so no reason to try and protect it during the process. The last barrel I made I epoxied in a .75 OD thin wall stainless liner which, really, is the way to go for corrosion resistance. I don't think I will go that far on this one. Small parts are heat blued. This provides good looks and some level of corrosion protection without much fuss. Some kind of black paint that went away fast was used on the originals. Wood used is from a wild cherry I cut down some time ago. The slider could have been made of a number of materials, I had this 1/4-inch steel on hand and the more weight the better. In truth, I could find nothing detailing the construction of a recoil slider after looking at ALL the carronades I could find on the web. I guess the bottom of these things are not interesting. There are still eye bolts to be installed and loading tools to be made. Tomorrow, it gets mounted to the gun deck, and I construct the partial ships bulwarks where the recoil restraining rope as used on the real deal, which is permanent, will be fixed in place. Last photo is the somewhat over engineered rear roller truck. Again, looking for weight.