What is a "nipple" on a percussion cap muzzleloader?

A nipple on a percussion cap muzzleloader is indeed a small threaded metal tube designed to hold the percussion cap. This component plays a crucial role in the firing mechanism of muzzleloaders that use percussion caps instead of flint locks. When the trigger is pulled, the hammer strikes the percussion cap, causing it to ignite. This ignition then produces a small flame that travels through the nipple into the powder chamber, effectively igniting the gunpowder charge and firing the projectile.

Understanding the function of the nipple is essential for proper loading, maintenance, and safety practices when handling these firearms. Ensuring that the nipple is clean and free of obstructions is critical for reliable ignition during shooting.