Sorry it took so long for me to answer, my Gatling has been on the backburner for some time, I got married. My carrier and barrel plates are all made from 17-4 stainless, only because I happened on a nice length of it at the scrapyard. Next up for me are my barrels. I have the tubes, just need to cut the liners, solder them in, and machine them. My buddy says he\'ll have the woodwork for the carriage done soon also.