Hubbard used to make one, but he stopped because there was too much variance in the threads on the NEF barrels. I was lucky and got one of the few that he produced. It handles Blackhorn 209 really well. The guys on Graybeard's website have used a bunch of other ideas, but a company called Metrics Unlimited has the best breech plug. For some reason they were banned on Graybeard and the guys there call it the breech plug that must not be named when posting. Metrics Unlimited has a website, so Google it and give them a call. Make sure you order the right one. The early barrels had a 7/8 diameter plug and newer barrels have a 5/8 plug.
