I make a twist pen with a .308 casing for the lower barrel and deer antler for the upper. I have someone who supplies me with both. I add a copper tip, slimline transmission and ink and a gold Euro-style domed cap and rifle clip. I recently had a run on them (that's a good thing for me) and had to restock components. Most places were out of one component or another. I found penkits.biz had everything except the copper tips. That is the only place I have found that I can order the tips. I had enough tips for some of the orders, and I will raid my copper slimline kits for the tips and replace those at some point. I considered buying more copper slimline kits just for the tips. Does anyone else sell components like penkits does? I couldn't even find them on Ebay.