Breech plug primer cap adapter

摘要

A cap adapter breech plug for muzzle loading firearms utilizes a cylindrical plug with barrel and breech ends and having a passage extending axially therethrough, a coaxial counterbore about the passage at the breech end of the plug, an axial slot along the side of the counterbore, and an exhaust passage extending generally radially from the passage adjacent the inner end of the counterbore to the outer surface of the plug for exhausting gases from the axially extending passage. A spring seated in the plug has a portion extending through the axial slot and into the counterbore to bear resiliently against the casing of a cap seated in the counterbore to retain it in the plug.