I have checked locally, I have checked online Cabela's, online Sportsman's warehouse, MidwayUSA, Midsouth shooters supply and no one offers them, all they offer are metric. When did the United States go metric? Needless to say, that is a bit disconcerting. I have musket nipples and musket percussion caps but I would like to get at least one extra 1/4-28 thread #11 nipple for this rifle because I found some Winchester Magnum #11 percussion caps and they work GREAT! No misfires at all. Pedersoli offers the nipples and I could have gotten them for what I consider an exhorbitant price but that's the way it goes. But then, the shipping charges are higher than the cost of the nipples! This must be what happens when you deal with socialist countries.