I am a small one person operation to manufacture and produce mini black powder cannons. Demand has exceeded my production capabilities so I am looking to source the brass barrels from an outside party in small (roughly 30-60 pieces) batches at a time. The barrels are roughly 3.75 inches long and. 75 inches in diameter at their widest point not including the pivot. I have 3 different cosmetic designs each offered in two different bore sizes, 5.5mm bore and 4.5mm bore. I have ". Iges" drawing files for each barrel in each bore size, total of 6 files. Located in the eastern United States. Would prefer a polished or Polish ready finish.