The Thunder Nipple uses an 8mm threat that tapers at the end to lock into the Traditions Thunder Dome Breech Plug. This magnum ignition system assures you a torch-like flame to ignite the powder. (When using the 209 Adapter, you must use the magnum hammer.) Traditions Firearms is the only muzzleloader company that carries a full line of accessories including loading and shooting tools, cleaning accessories, snap caps, training cartridges, projectiles, and much more!